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Move dav to tool dir.

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This commit is contained in:
zicla
2019-04-26 03:11:15 +08:00
parent c5de9ce9eb
commit 16749d1fa1
8 changed files with 42 additions and 42 deletions
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548
code/tool/dav/prop.go Normal file
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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package dav
import (
"bytes"
"errors"
"fmt"
"io"
"net/http"
"tank/code/result"
"tank/code/tool/dav/xml"
)
// Proppatch describes a property update instruction as defined in RFC 4918.
// See http://www.webdav.org/specs/rfc4918.html#METHOD_PROPPATCH
type Proppatch struct {
// Remove specifies whether this patch removes properties. If it does not
// remove them, it sets them.
Remove bool
// Props contains the properties to be set or removed.
Props []Property
}
// Propstat describes a XML propstat element as defined in RFC 4918.
// See http://www.webdav.org/specs/rfc4918.html#ELEMENT_propstat
type Propstat struct {
// Props contains the properties for which Status applies.
Props []Property
// Status defines the HTTP status code of the properties in Prop.
// Allowed values include, but are not limited to the WebDAV status
// code extensions for HTTP/1.1.
// http://www.webdav.org/specs/rfc4918.html#status.code.extensions.to.http11
Status int
// XMLError contains the XML representation of the optional error element.
// XML content within this field must not rely on any predefined
// namespace declarations or prefixes. If empty, the XML error element
// is omitted.
XMLError string
// ResponseDescription contains the contents of the optional
// responsedescription field. If empty, the XML element is omitted.
ResponseDescription string
}
// DeadPropsHolder holds the dead properties of a resource.
//
// Dead properties are those properties that are explicitly defined. In
// comparison, live properties, such as DAV:getcontentlength, are implicitly
// defined by the underlying resource, and cannot be explicitly overridden or
// removed. See the Terminology section of
// http://www.webdav.org/specs/rfc4918.html#rfc.section.3
//
// There is a whitelist of the names of live properties. This package handles
// all live properties, and will only pass non-whitelisted names to the Patch
// method of DeadPropsHolder implementations.
type DeadPropsHolder interface {
// DeadProps returns a copy of the dead properties held.
DeadProps() (map[xml.Name]Property, error)
// Patch patches the dead properties held.
//
// Patching is atomic; either all or no patches succeed. It returns (nil,
// non-nil) if an internal server error occurred, otherwise the Propstats
// collectively contain one Property for each proposed patch Property. If
// all patches succeed, Patch returns a slice of length one and a Propstat
// element with a 200 OK HTTP status code. If none succeed, for reasons
// other than an internal server error, no Propstat has status 200 OK.
//
// For more details on when various HTTP status codes apply, see
// http://www.webdav.org/specs/rfc4918.html#PROPPATCH-status
Patch([]Proppatch) ([]Propstat, error)
}
func EscapeXML(s string) string {
for i := 0; i < len(s); i++ {
// As an optimization, if s contains only ASCII letters, digits or a
// few special characters, the escaped value is s itself and we don't
// need to allocate a buffer and convert between string and []byte.
switch c := s[i]; {
case c == ' ' || c == '_' ||
('+' <= c && c <= '9') || // Digits as well as + , - . and /
('A' <= c && c <= 'Z') ||
('a' <= c && c <= 'z'):
continue
}
// Otherwise, go through the full escaping process.
var buf bytes.Buffer
xml.EscapeText(&buf, []byte(s))
return buf.String()
}
return s
}
// http://www.webdav.org/specs/rfc4918.html#status.code.extensions.to.http11
const (
StatusMulti = 207
StatusUnprocessableEntity = 422
StatusLocked = 423
StatusFailedDependency = 424
StatusInsufficientStorage = 507
)
func StatusText(code int) string {
switch code {
case StatusMulti:
return "Multi-Status"
case StatusUnprocessableEntity:
return "Unprocessable Entity"
case StatusLocked:
return "Locked"
case StatusFailedDependency:
return "Failed Dependency"
case StatusInsufficientStorage:
return "Insufficient Storage"
}
return http.StatusText(code)
}
var (
errInvalidPropfind = errors.New("webdav: invalid propfind")
errInvalidResponse = errors.New("webdav: invalid response")
)
// http://www.webdav.org/specs/rfc4918.html#ELEMENT_lockinfo
type LockInfo struct {
XMLName xml.Name `xml:"lockinfo"`
Exclusive *struct{} `xml:"lockscope>exclusive"`
Shared *struct{} `xml:"lockscope>shared"`
Write *struct{} `xml:"locktype>write"`
Owner Owner `xml:"owner"`
}
// http://www.webdav.org/specs/rfc4918.html#ELEMENT_owner
type Owner struct {
InnerXML string `xml:",innerxml"`
}
//这是一个带字节计数器的Reader，可以知道总共读取了多少个字节。
type CountingReader struct {
n int
reader io.Reader
}
func (c *CountingReader) Read(p []byte) (int, error) {
n, err := c.reader.Read(p)
c.n += n
return n, err
}
// Next returns the next token, if any, in the XML stream of d.
// RFC 4918 requires to ignore comments, processing instructions
// and directives.
// http://www.webdav.org/specs/rfc4918.html#property_values
// http://www.webdav.org/specs/rfc4918.html#xml-extensibility
func next(d *xml.Decoder) (xml.Token, error) {
for {
t, err := d.Token()
if err != nil {
return t, err
}
switch t.(type) {
case xml.Comment, xml.Directive, xml.ProcInst:
continue
default:
return t, nil
}
}
}
// http://www.webdav.org/specs/rfc4918.html#ELEMENT_prop (for propfind)
type PropfindProps []xml.Name
// UnmarshalXML appends the property names enclosed within start to pn.
//
// It returns an error if start does not contain any properties or if
// properties contain values. Character data between properties is ignored.
func (pn *PropfindProps) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
for {
t, err := next(d)
if err != nil {
return err
}
switch t.(type) {
case xml.EndElement:
if len(*pn) == 0 {
return fmt.Errorf("%s must not be empty", start.Name.Local)
}
return nil
case xml.StartElement:
name := t.(xml.StartElement).Name
t, err = next(d)
if err != nil {
return err
}
if _, ok := t.(xml.EndElement); !ok {
return fmt.Errorf("unexpected token %T", t)
}
*pn = append(*pn, xml.Name(name))
}
}
}
// http://www.webdav.org/specs/rfc4918.html#ELEMENT_propfind
// <!ELEMENT propfind ( propname | (allprop, include?) | prop ) >
type Propfind struct {
XMLName xml.Name `xml:"DAV: propfind"`
Allprop *struct{} `xml:"DAV: allprop"`
Propname *struct{} `xml:"DAV: propname"`
Prop PropfindProps `xml:"DAV: prop"`
Include PropfindProps `xml:"DAV: include"`
}
//从request中读出需要的属性。比如：getcontentlength 大小 creationdate 创建时间
func ReadPropfind(reader io.Reader) (propfind *Propfind) {
propfind = &Propfind{}
c := CountingReader{reader: reader}
if err := xml.NewDecoder(&c).Decode(&propfind); err != nil {
if err == io.EOF {
if c.n == 0 {
// An empty body means to propfind allprop.
// http://www.webdav.org/specs/rfc4918.html#METHOD_PROPFIND
return &Propfind{Allprop: new(struct{})}
}
err = errInvalidPropfind
}
panic(result.BadRequest(err.Error()))
}
if propfind.Allprop == nil && propfind.Include != nil {
panic(result.BadRequest(errInvalidPropfind.Error()))
}
if propfind.Allprop != nil && (propfind.Prop != nil || propfind.Propname != nil) {
panic(result.BadRequest(errInvalidPropfind.Error()))
}
if propfind.Prop != nil && propfind.Propname != nil {
panic(result.BadRequest(errInvalidPropfind.Error()))
}
if propfind.Propname == nil && propfind.Allprop == nil && propfind.Prop == nil {
panic(result.BadRequest(errInvalidPropfind.Error()))
}
return propfind
}
// Property represents a single DAV resource property as defined in RFC 4918.
// See http://www.webdav.org/specs/rfc4918.html#data.model.for.resource.properties
type Property struct {
// XMLName is the fully qualified name that identifies this property.
XMLName xml.Name
// Lang is an optional xml:lang attribute.
Lang string `xml:"xml:lang,attr,omitempty"`
// InnerXML contains the XML representation of the property value.
// See http://www.webdav.org/specs/rfc4918.html#property_values
//
// Property values of complex type or mixed-content must have fully
// expanded XML namespaces or be self-contained with according
// XML namespace declarations. They must not rely on any XML
// namespace declarations within the scope of the XML document,
// even including the DAV: namespace.
InnerXML []byte `xml:",innerxml"`
}
// ixmlProperty is the same as the Property type except it holds an xml.Name
// instead of an xml.Name.
type IxmlProperty struct {
XMLName xml.Name
Lang string `xml:"xml:lang,attr,omitempty"`
InnerXML []byte `xml:",innerxml"`
}
// http://www.webdav.org/specs/rfc4918.html#ELEMENT_error
// See MultiStatusWriter for the "D:" namespace prefix.
type XmlError struct {
XMLName xml.Name `xml:"D:error"`
InnerXML []byte `xml:",innerxml"`
}
// http://www.webdav.org/specs/rfc4918.html#ELEMENT_propstat
// See MultiStatusWriter for the "D:" namespace prefix.
type SubPropstat struct {
Prop []Property `xml:"D:prop>_ignored_"`
Status string `xml:"D:status"`
Error *XmlError `xml:"D:error"`
ResponseDescription string `xml:"D:responsedescription,omitempty"`
}
// ixmlPropstat is the same as the propstat type except it holds an xml.Name
// instead of an xml.Name.
type IxmlPropstat struct {
Prop []IxmlProperty `xml:"D:prop>_ignored_"`
Status string `xml:"D:status"`
Error *XmlError `xml:"D:error"`
ResponseDescription string `xml:"D:responsedescription,omitempty"`
}
// MarshalXML prepends the "D:" namespace prefix on properties in the DAV: namespace
// before encoding. See MultiStatusWriter.
func (ps SubPropstat) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
// Convert from a propstat to an ixmlPropstat.
ixmlPs := IxmlPropstat{
Prop: make([]IxmlProperty, len(ps.Prop)),
Status: ps.Status,
Error: ps.Error,
ResponseDescription: ps.ResponseDescription,
}
for k, prop := range ps.Prop {
ixmlPs.Prop[k] = IxmlProperty{
XMLName: xml.Name(prop.XMLName),
Lang: prop.Lang,
InnerXML: prop.InnerXML,
}
}
for k, prop := range ixmlPs.Prop {
if prop.XMLName.Space == "DAV:" {
prop.XMLName = xml.Name{Space: "", Local: "D:" + prop.XMLName.Local}
ixmlPs.Prop[k] = prop
}
}
// Distinct type to avoid infinite recursion of MarshalXML.
type newpropstat IxmlPropstat
return e.EncodeElement(newpropstat(ixmlPs), start)
}
// http://www.webdav.org/specs/rfc4918.html#ELEMENT_response
// See MultiStatusWriter for the "D:" namespace prefix.
type Response struct {
XMLName xml.Name `xml:"D:response"`
Href []string `xml:"D:href"`
Propstat []SubPropstat `xml:"D:propstat"`
Status string `xml:"D:status,omitempty"`
Error *XmlError `xml:"D:error"`
ResponseDescription string `xml:"D:responsedescription,omitempty"`
}
// MultistatusWriter marshals one or more Responses into a XML
// multistatus response.
// See http://www.webdav.org/specs/rfc4918.html#ELEMENT_multistatus
// TODO(rsto, mpl): As a workaround, the "D:" namespace prefix, defined as
// "DAV:" on this element, is prepended on the nested response, as well as on all
// its nested elements. All property names in the DAV: namespace are prefixed as
// well. This is because some versions of Mini-Redirector (on windows 7) ignore
// elements with a default namespace (no prefixed namespace). A less intrusive fix
// should be possible after golang.org/cl/11074. See https://golang.org/issue/11177
type MultiStatusWriter struct {
// ResponseDescription contains the optional responsedescription
// of the multistatus XML element. Only the latest content before
// close will be emitted. Empty response descriptions are not
// written.
ResponseDescription string
Writer http.ResponseWriter
Encoder *xml.Encoder
}
// Write validates and emits a DAV response as part of a multistatus response
// element.
//
// It sets the HTTP status code of its underlying http.ResponseWriter to 207
// (Multi-Status) and populates the Content-Type header. If r is the
// first, valid response to be written, Write prepends the XML representation
// of r with a multistatus tag. Callers must call close after the last response
// has been written.
func (this *MultiStatusWriter) Write(response *Response) error {
switch len(response.Href) {
case 0:
return errInvalidResponse
case 1:
if len(response.Propstat) > 0 != (response.Status == "") {
return errInvalidResponse
}
default:
if len(response.Propstat) > 0 || response.Status == "" {
return errInvalidResponse
}
}
err := this.writeHeader()
if err != nil {
return err
}
return this.Encoder.Encode(response)
}
// writeHeader writes a XML multistatus start element on w's underlying
// http.ResponseWriter and returns the result of the write operation.
// After the first write attempt, writeHeader becomes a no-op.
func (this *MultiStatusWriter) writeHeader() error {
if this.Encoder != nil {
return nil
}
this.Writer.Header().Add("Content-Type", "text/xml; charset=utf-8")
this.Writer.WriteHeader(StatusMulti)
_, err := fmt.Fprintf(this.Writer, `<?xml version="1.0" encoding="UTF-8"?>`)
if err != nil {
return err
}
this.Encoder = xml.NewEncoder(this.Writer)
return this.Encoder.EncodeToken(xml.StartElement{
Name: xml.Name{
Space: "DAV:",
Local: "multistatus",
},
Attr: []xml.Attr{{
Name: xml.Name{Space: "xmlns", Local: "D"},
Value: "DAV:",
}},
})
}
// Close completes the marshalling of the multistatus response. It returns
// an error if the multistatus response could not be completed. If both the
// return value and field Encoder of w are nil, then no multistatus response has
// been written.
func (this *MultiStatusWriter) Close() error {
if this.Encoder == nil {
return nil
}
var end []xml.Token
if this.ResponseDescription != "" {
name := xml.Name{Space: "DAV:", Local: "responsedescription"}
end = append(end,
xml.StartElement{Name: name},
xml.CharData(this.ResponseDescription),
xml.EndElement{Name: name},
)
}
end = append(end, xml.EndElement{
Name: xml.Name{Space: "DAV:", Local: "multistatus"},
})
for _, t := range end {
err := this.Encoder.EncodeToken(t)
if err != nil {
return err
}
}
return this.Encoder.Flush()
}
var xmlLangName = xml.Name{Space: "http://www.w3.org/XML/1998/namespace", Local: "lang"}
func xmlLang(s xml.StartElement, d string) string {
for _, attr := range s.Attr {
if attr.Name == xmlLangName {
return attr.Value
}
}
return d
}
type XmlValue []byte
func (v *XmlValue) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
// The XML value of a property can be arbitrary, mixed-content XML.
// To make sure that the unmarshalled value contains all required
// namespaces, we encode all the property value XML tokens into a
// buffer. This forces the encoder to redeclare any used namespaces.
var b bytes.Buffer
e := xml.NewEncoder(&b)
for {
t, err := next(d)
if err != nil {
return err
}
if e, ok := t.(xml.EndElement); ok && e.Name == start.Name {
break
}
if err = e.EncodeToken(t); err != nil {
return err
}
}
err := e.Flush()
if err != nil {
return err
}
*v = b.Bytes()
return nil
}
// http://www.webdav.org/specs/rfc4918.html#ELEMENT_prop (for proppatch)
type ProppatchProps []Property
// UnmarshalXML appends the property names and values enclosed within start
// to ps.
//
// An xml:lang attribute that is defined either on the DAV:prop or property
// name XML element is propagated to the property's Lang field.
//
// UnmarshalXML returns an error if start does not contain any properties or if
// property values contain syntactically incorrect XML.
func (ps *ProppatchProps) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
lang := xmlLang(start, "")
for {
t, err := next(d)
if err != nil {
return err
}
switch elem := t.(type) {
case xml.EndElement:
if len(*ps) == 0 {
return fmt.Errorf("%s must not be empty", start.Name.Local)
}
return nil
case xml.StartElement:
p := Property{
XMLName: xml.Name(t.(xml.StartElement).Name),
Lang: xmlLang(t.(xml.StartElement), lang),
}
err = d.DecodeElement(((*XmlValue)(&p.InnerXML)), &elem)
if err != nil {
return err
}
*ps = append(*ps, p)
}
}
}
// http://www.webdav.org/specs/rfc4918.html#ELEMENT_set
// http://www.webdav.org/specs/rfc4918.html#ELEMENT_remove
type SetRemove struct {
XMLName xml.Name
Lang string `xml:"xml:lang,attr,omitempty"`
Prop ProppatchProps `xml:"DAV: prop"`
}
// http://www.webdav.org/specs/rfc4918.html#ELEMENT_propertyupdate
type PropertyUpdate struct {
XMLName xml.Name `xml:"DAV: propertyupdate"`
Lang string `xml:"xml:lang,attr,omitempty"`
SetRemove []SetRemove `xml:",any"`
}

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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package xml
import (
"bytes"
"encoding"
"errors"
"fmt"
"reflect"
"strconv"
"strings"
)
// BUG(rsc): Mapping between XML elements and data structures is inherently flawed:
// an XML element is an order-dependent collection of anonymous
// values, while a data structure is an order-independent collection
// of named values.
// See package json for a textual representation more suitable
// to data structures.
// Unmarshal parses the XML-encoded data and stores the result in
// the value pointed to by v, which must be an arbitrary struct,
// slice, or string. Well-formed data that does not fit into v is
// discarded.
//
// Because Unmarshal uses the reflect package, it can only assign
// to exported (upper case) fields. Unmarshal uses a case-sensitive
// comparison to match XML element names to tag values and struct
// field names.
//
// Unmarshal maps an XML element to a struct using the following rules.
// In the rules, the tag of a field refers to the value associated with the
// key 'xml' in the struct field's tag (see the example above).
//
// * If the struct has a field of type []byte or string with tag
// ",innerxml", Unmarshal accumulates the raw XML nested inside the
// element in that field. The rest of the rules still apply.
//
// * If the struct has a field named XMLName of type xml.Name,
// Unmarshal records the element name in that field.
//
// * If the XMLName field has an associated tag of the form
// "name" or "namespace-URL name", the XML element must have
// the given name (and, optionally, name space) or else Unmarshal
// returns an error.
//
// * If the XML element has an attribute whose name matches a
// struct field name with an associated tag containing ",attr" or
// the explicit name in a struct field tag of the form "name,attr",
// Unmarshal records the attribute value in that field.
//
// * If the XML element contains character data, that data is
// accumulated in the first struct field that has tag ",chardata".
// The struct field may have type []byte or string.
// If there is no such field, the character data is discarded.
//
// * If the XML element contains comments, they are accumulated in
// the first struct field that has tag ",comment". The struct
// field may have type []byte or string. If there is no such
// field, the comments are discarded.
//
// * If the XML element contains a sub-element whose name matches
// the prefix of a tag formatted as "a" or "a>b>c", unmarshal
// will descend into the XML structure looking for elements with the
// given names, and will map the innermost elements to that struct
// field. A tag starting with ">" is equivalent to one starting
// with the field name followed by ">".
//
// * If the XML element contains a sub-element whose name matches
// a struct field's XMLName tag and the struct field has no
// explicit name tag as per the previous rule, unmarshal maps
// the sub-element to that struct field.
//
// * If the XML element contains a sub-element whose name matches a
// field without any mode flags (",attr", ",chardata", etc), Unmarshal
// maps the sub-element to that struct field.
//
// * If the XML element contains a sub-element that hasn't matched any
// of the above rules and the struct has a field with tag ",any",
// unmarshal maps the sub-element to that struct field.
//
// * An anonymous struct field is handled as if the fields of its
// value were part of the outer struct.
//
// * A struct field with tag "-" is never unmarshalled into.
//
// Unmarshal maps an XML element to a string or []byte by saving the
// concatenation of that element's character data in the string or
// []byte. The saved []byte is never nil.
//
// Unmarshal maps an attribute value to a string or []byte by saving
// the value in the string or slice.
//
// Unmarshal maps an XML element to a slice by extending the length of
// the slice and mapping the element to the newly created value.
//
// Unmarshal maps an XML element or attribute value to a bool by
// setting it to the boolean value represented by the string.
//
// Unmarshal maps an XML element or attribute value to an integer or
// floating-point field by setting the field to the result of
// interpreting the string value in decimal. There is no check for
// overflow.
//
// Unmarshal maps an XML element to an xml.Name by recording the
// element name.
//
// Unmarshal maps an XML element to a pointer by setting the pointer
// to a freshly allocated value and then mapping the element to that value.
//
func Unmarshal(data []byte, v interface{}) error {
return NewDecoder(bytes.NewReader(data)).Decode(v)
}
// Decode works like xml.Unmarshal, except it reads the decoder
// stream to find the start element.
func (d *Decoder) Decode(v interface{}) error {
return d.DecodeElement(v, nil)
}
// DecodeElement works like xml.Unmarshal except that it takes
// a pointer to the start XML element to decode into v.
// It is useful when a client reads some raw XML tokens itself
// but also wants to defer to Unmarshal for some elements.
func (d *Decoder) DecodeElement(v interface{}, start *StartElement) error {
val := reflect.ValueOf(v)
if val.Kind() != reflect.Ptr {
return errors.New("non-pointer passed to Unmarshal")
}
return d.unmarshal(val.Elem(), start)
}
// An UnmarshalError represents an error in the unmarshalling process.
type UnmarshalError string
func (e UnmarshalError) Error() string { return string(e) }
// Unmarshaler is the interface implemented by objects that can unmarshal
// an XML element description of themselves.
//
// UnmarshalXML decodes a single XML element
// beginning with the given start element.
// If it returns an error, the outer call to Unmarshal stops and
// returns that error.
// UnmarshalXML must consume exactly one XML element.
// One common implementation strategy is to unmarshal into
// a separate value with a layout matching the expected XML
// using d.DecodeElement, and then to copy the data from
// that value into the receiver.
// Another common strategy is to use d.Token to process the
// XML object one token at a time.
// UnmarshalXML may not use d.RawToken.
type Unmarshaler interface {
UnmarshalXML(d *Decoder, start StartElement) error
}
// UnmarshalerAttr is the interface implemented by objects that can unmarshal
// an XML attribute description of themselves.
//
// UnmarshalXMLAttr decodes a single XML attribute.
// If it returns an error, the outer call to Unmarshal stops and
// returns that error.
// UnmarshalXMLAttr is used only for struct fields with the
// "attr" option in the field tag.
type UnmarshalerAttr interface {
UnmarshalXMLAttr(attr Attr) error
}
// receiverType returns the receiver type to use in an expression like "%s.MethodName".
func receiverType(val interface{}) string {
t := reflect.TypeOf(val)
if t.Name() != "" {
return t.String()
}
return "(" + t.String() + ")"
}
// unmarshalInterface unmarshals a single XML element into val.
// start is the opening tag of the element.
func (p *Decoder) unmarshalInterface(val Unmarshaler, start *StartElement) error {
// Record that decoder must stop at end tag corresponding to start.
p.pushEOF()
p.unmarshalDepth++
err := val.UnmarshalXML(p, *start)
p.unmarshalDepth--
if err != nil {
p.popEOF()
return err
}
if !p.popEOF() {
return fmt.Errorf("xml: %s.UnmarshalXML did not consume entire <%s> element", receiverType(val), start.Name.Local)
}
return nil
}
// unmarshalTextInterface unmarshals a single XML element into val.
// The chardata contained in the element (but not its children)
// is passed to the text unmarshaler.
func (p *Decoder) unmarshalTextInterface(val encoding.TextUnmarshaler, start *StartElement) error {
var buf []byte
depth := 1
for depth > 0 {
t, err := p.Token()
if err != nil {
return err
}
switch t := t.(type) {
case CharData:
if depth == 1 {
buf = append(buf, t...)
}
case StartElement:
depth++
case EndElement:
depth--
}
}
return val.UnmarshalText(buf)
}
// unmarshalAttr unmarshals a single XML attribute into val.
func (p *Decoder) unmarshalAttr(val reflect.Value, attr Attr) error {
if val.Kind() == reflect.Ptr {
if val.IsNil() {
val.Set(reflect.New(val.Type().Elem()))
}
val = val.Elem()
}
if val.CanInterface() && val.Type().Implements(unmarshalerAttrType) {
// This is an unmarshaler with a non-pointer receiver,
// so it's likely to be incorrect, but we do what we're told.
return val.Interface().(UnmarshalerAttr).UnmarshalXMLAttr(attr)
}
if val.CanAddr() {
pv := val.Addr()
if pv.CanInterface() && pv.Type().Implements(unmarshalerAttrType) {
return pv.Interface().(UnmarshalerAttr).UnmarshalXMLAttr(attr)
}
}
// Not an UnmarshalerAttr; try encoding.TextUnmarshaler.
if val.CanInterface() && val.Type().Implements(textUnmarshalerType) {
// This is an unmarshaler with a non-pointer receiver,
// so it's likely to be incorrect, but we do what we're told.
return val.Interface().(encoding.TextUnmarshaler).UnmarshalText([]byte(attr.Value))
}
if val.CanAddr() {
pv := val.Addr()
if pv.CanInterface() && pv.Type().Implements(textUnmarshalerType) {
return pv.Interface().(encoding.TextUnmarshaler).UnmarshalText([]byte(attr.Value))
}
}
copyValue(val, []byte(attr.Value))
return nil
}
var (
unmarshalerType = reflect.TypeOf((*Unmarshaler)(nil)).Elem()
unmarshalerAttrType = reflect.TypeOf((*UnmarshalerAttr)(nil)).Elem()
textUnmarshalerType = reflect.TypeOf((*encoding.TextUnmarshaler)(nil)).Elem()
)
// Unmarshal a single XML element into val.
func (p *Decoder) unmarshal(val reflect.Value, start *StartElement) error {
// Find start element if we need it.
if start == nil {
for {
tok, err := p.Token()
if err != nil {
return err
}
if t, ok := tok.(StartElement); ok {
start = &t
break
}
}
}
// Load value from interface, but only if the result will be
// usefully addressable.
if val.Kind() == reflect.Interface && !val.IsNil() {
e := val.Elem()
if e.Kind() == reflect.Ptr && !e.IsNil() {
val = e
}
}
if val.Kind() == reflect.Ptr {
if val.IsNil() {
val.Set(reflect.New(val.Type().Elem()))
}
val = val.Elem()
}
if val.CanInterface() && val.Type().Implements(unmarshalerType) {
// This is an unmarshaler with a non-pointer receiver,
// so it's likely to be incorrect, but we do what we're told.
return p.unmarshalInterface(val.Interface().(Unmarshaler), start)
}
if val.CanAddr() {
pv := val.Addr()
if pv.CanInterface() && pv.Type().Implements(unmarshalerType) {
return p.unmarshalInterface(pv.Interface().(Unmarshaler), start)
}
}
if val.CanInterface() && val.Type().Implements(textUnmarshalerType) {
return p.unmarshalTextInterface(val.Interface().(encoding.TextUnmarshaler), start)
}
if val.CanAddr() {
pv := val.Addr()
if pv.CanInterface() && pv.Type().Implements(textUnmarshalerType) {
return p.unmarshalTextInterface(pv.Interface().(encoding.TextUnmarshaler), start)
}
}
var (
data []byte
saveData reflect.Value
comment []byte
saveComment reflect.Value
saveXML reflect.Value
saveXMLIndex int
saveXMLData []byte
saveAny reflect.Value
sv reflect.Value
tinfo *typeInfo
err error
)
switch v := val; v.Kind() {
default:
return errors.New("unknown type " + v.Type().String())
case reflect.Interface:
// TODO: For now, simply ignore the field. In the near
// future we may choose to unmarshal the start
// element on it, if not nil.
return p.Skip()
case reflect.Slice:
typ := v.Type()
if typ.Elem().Kind() == reflect.Uint8 {
// []byte
saveData = v
break
}
// Slice of element values.
// Grow slice.
n := v.Len()
if n >= v.Cap() {
ncap := 2 * n
if ncap < 4 {
ncap = 4
}
new := reflect.MakeSlice(typ, n, ncap)
reflect.Copy(new, v)
v.Set(new)
}
v.SetLen(n + 1)
// Recur to read element into slice.
if err := p.unmarshal(v.Index(n), start); err != nil {
v.SetLen(n)
return err
}
return nil
case reflect.Bool, reflect.Float32, reflect.Float64, reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr, reflect.String:
saveData = v
case reflect.Struct:
typ := v.Type()
if typ == nameType {
v.Set(reflect.ValueOf(start.Name))
break
}
sv = v
tinfo, err = getTypeInfo(typ)
if err != nil {
return err
}
// Validate and assign element name.
if tinfo.xmlname != nil {
finfo := tinfo.xmlname
if finfo.name != "" && finfo.name != start.Name.Local {
return UnmarshalError("expected element type <" + finfo.name + "> but have <" + start.Name.Local + ">")
}
if finfo.xmlns != "" && finfo.xmlns != start.Name.Space {
e := "expected element <" + finfo.name + "> in name space " + finfo.xmlns + " but have "
if start.Name.Space == "" {
e += "no name space"
} else {
e += start.Name.Space
}
return UnmarshalError(e)
}
fv := finfo.value(sv)
if _, ok := fv.Interface().(Name); ok {
fv.Set(reflect.ValueOf(start.Name))
}
}
// Assign attributes.
// Also, determine whether we need to save character data or comments.
for i := range tinfo.fields {
finfo := &tinfo.fields[i]
switch finfo.flags & fMode {
case fAttr:
strv := finfo.value(sv)
// Look for attribute.
for _, a := range start.Attr {
if a.Name.Local == finfo.name && (finfo.xmlns == "" || finfo.xmlns == a.Name.Space) {
if err := p.unmarshalAttr(strv, a); err != nil {
return err
}
break
}
}
case fCharData:
if !saveData.IsValid() {
saveData = finfo.value(sv)
}
case fComment:
if !saveComment.IsValid() {
saveComment = finfo.value(sv)
}
case fAny, fAny | fElement:
if !saveAny.IsValid() {
saveAny = finfo.value(sv)
}
case fInnerXml:
if !saveXML.IsValid() {
saveXML = finfo.value(sv)
if p.saved == nil {
saveXMLIndex = 0
p.saved = new(bytes.Buffer)
} else {
saveXMLIndex = p.savedOffset()
}
}
}
}
}
// Find end element.
// Process sub-elements along the way.
Loop:
for {
var savedOffset int
if saveXML.IsValid() {
savedOffset = p.savedOffset()
}
tok, err := p.Token()
if err != nil {
return err
}
switch t := tok.(type) {
case StartElement:
consumed := false
if sv.IsValid() {
consumed, err = p.unmarshalPath(tinfo, sv, nil, &t)
if err != nil {
return err
}
if !consumed && saveAny.IsValid() {
consumed = true
if err := p.unmarshal(saveAny, &t); err != nil {
return err
}
}
}
if !consumed {
if err := p.Skip(); err != nil {
return err
}
}
case EndElement:
if saveXML.IsValid() {
saveXMLData = p.saved.Bytes()[saveXMLIndex:savedOffset]
if saveXMLIndex == 0 {
p.saved = nil
}
}
break Loop
case CharData:
if saveData.IsValid() {
data = append(data, t...)
}
case Comment:
if saveComment.IsValid() {
comment = append(comment, t...)
}
}
}
if saveData.IsValid() && saveData.CanInterface() && saveData.Type().Implements(textUnmarshalerType) {
if err := saveData.Interface().(encoding.TextUnmarshaler).UnmarshalText(data); err != nil {
return err
}
saveData = reflect.Value{}
}
if saveData.IsValid() && saveData.CanAddr() {
pv := saveData.Addr()
if pv.CanInterface() && pv.Type().Implements(textUnmarshalerType) {
if err := pv.Interface().(encoding.TextUnmarshaler).UnmarshalText(data); err != nil {
return err
}
saveData = reflect.Value{}
}
}
if err := copyValue(saveData, data); err != nil {
return err
}
switch t := saveComment; t.Kind() {
case reflect.String:
t.SetString(string(comment))
case reflect.Slice:
t.Set(reflect.ValueOf(comment))
}
switch t := saveXML; t.Kind() {
case reflect.String:
t.SetString(string(saveXMLData))
case reflect.Slice:
t.Set(reflect.ValueOf(saveXMLData))
}
return nil
}
func copyValue(dst reflect.Value, src []byte) (err error) {
dst0 := dst
if dst.Kind() == reflect.Ptr {
if dst.IsNil() {
dst.Set(reflect.New(dst.Type().Elem()))
}
dst = dst.Elem()
}
// Save accumulated data.
switch dst.Kind() {
case reflect.Invalid:
// Probably a comment.
default:
return errors.New("cannot unmarshal into " + dst0.Type().String())
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
itmp, err := strconv.ParseInt(string(src), 10, dst.Type().Bits())
if err != nil {
return err
}
dst.SetInt(itmp)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
utmp, err := strconv.ParseUint(string(src), 10, dst.Type().Bits())
if err != nil {
return err
}
dst.SetUint(utmp)
case reflect.Float32, reflect.Float64:
ftmp, err := strconv.ParseFloat(string(src), dst.Type().Bits())
if err != nil {
return err
}
dst.SetFloat(ftmp)
case reflect.Bool:
value, err := strconv.ParseBool(strings.TrimSpace(string(src)))
if err != nil {
return err
}
dst.SetBool(value)
case reflect.String:
dst.SetString(string(src))
case reflect.Slice:
if len(src) == 0 {
// non-nil to flag presence
src = []byte{}
}
dst.SetBytes(src)
}
return nil
}
// unmarshalPath walks down an XML structure looking for wanted
// paths, and calls unmarshal on them.
// The consumed result tells whether XML elements have been consumed
// from the Decoder until start's matching end element, or if it's
// still untouched because start is uninteresting for sv's fields.
func (p *Decoder) unmarshalPath(tinfo *typeInfo, sv reflect.Value, parents []string, start *StartElement) (consumed bool, err error) {
recurse := false
Loop:
for i := range tinfo.fields {
finfo := &tinfo.fields[i]
if finfo.flags&fElement == 0 || len(finfo.parents) < len(parents) || finfo.xmlns != "" && finfo.xmlns != start.Name.Space {
continue
}
for j := range parents {
if parents[j] != finfo.parents[j] {
continue Loop
}
}
if len(finfo.parents) == len(parents) && finfo.name == start.Name.Local {
// It's a perfect match, unmarshal the field.
return true, p.unmarshal(finfo.value(sv), start)
}
if len(finfo.parents) > len(parents) && finfo.parents[len(parents)] == start.Name.Local {
// It's a prefix for the field. Break and recurse
// since it's not ok for one field path to be itself
// the prefix for another field path.
recurse = true
// We can reuse the same slice as long as we
// don't try to append to it.
parents = finfo.parents[:len(parents)+1]
break
}
}
if !recurse {
// We have no business with this element.
return false, nil
}
// The element is not a perfect match for any field, but one
// or more fields have the path to this element as a parent
// prefix. Recurse and attempt to match these.
for {
var tok Token
tok, err = p.Token()
if err != nil {
return true, err
}
switch t := tok.(type) {
case StartElement:
consumed2, err := p.unmarshalPath(tinfo, sv, parents, &t)
if err != nil {
return true, err
}
if !consumed2 {
if err := p.Skip(); err != nil {
return true, err
}
}
case EndElement:
return true, nil
}
}
}
// Skip reads tokens until it has consumed the end element
// matching the most recent start element already consumed.
// It recurs if it encounters a start element, so it can be used to
// skip nested structures.
// It returns nil if it finds an end element matching the start
// element; otherwise it returns an error describing the problem.
func (d *Decoder) Skip() error {
for {
tok, err := d.Token()
if err != nil {
return err
}
switch tok.(type) {
case StartElement:
if err := d.Skip(); err != nil {
return err
}
case EndElement:
return nil
}
}
}

371
code/tool/dav/xml/typeinfo.go Normal file
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@ -0,0 +1,371 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package xml
import (
"fmt"
"reflect"
"strings"
"sync"
)
// typeInfo holds details for the xml representation of a type.
type typeInfo struct {
xmlname *fieldInfo
fields []fieldInfo
}
// fieldInfo holds details for the xml representation of a single field.
type fieldInfo struct {
idx []int
name string
xmlns string
flags fieldFlags
parents []string
}
type fieldFlags int
const (
fElement fieldFlags = 1 << iota
fAttr
fCharData
fInnerXml
fComment
fAny
fOmitEmpty
fMode = fElement | fAttr | fCharData | fInnerXml | fComment | fAny
)
var tinfoMap = make(map[reflect.Type]*typeInfo)
var tinfoLock sync.RWMutex
var nameType = reflect.TypeOf(Name{})
// getTypeInfo returns the typeInfo structure with details necessary
// for marshalling and unmarshalling typ.
func getTypeInfo(typ reflect.Type) (*typeInfo, error) {
tinfoLock.RLock()
tinfo, ok := tinfoMap[typ]
tinfoLock.RUnlock()
if ok {
return tinfo, nil
}
tinfo = &typeInfo{}
if typ.Kind() == reflect.Struct && typ != nameType {
n := typ.NumField()
for i := 0; i < n; i++ {
f := typ.Field(i)
if f.PkgPath != "" || f.Tag.Get("xml") == "-" {
continue // Private field
}
// For embedded structs, embed its fields.
if f.Anonymous {
t := f.Type
if t.Kind() == reflect.Ptr {
t = t.Elem()
}
if t.Kind() == reflect.Struct {
inner, err := getTypeInfo(t)
if err != nil {
return nil, err
}
if tinfo.xmlname == nil {
tinfo.xmlname = inner.xmlname
}
for _, finfo := range inner.fields {
finfo.idx = append([]int{i}, finfo.idx...)
if err := addFieldInfo(typ, tinfo, &finfo); err != nil {
return nil, err
}
}
continue
}
}
finfo, err := structFieldInfo(typ, &f)
if err != nil {
return nil, err
}
if f.Name == "XMLName" {
tinfo.xmlname = finfo
continue
}
// Add the field if it doesn't conflict with other fields.
if err := addFieldInfo(typ, tinfo, finfo); err != nil {
return nil, err
}
}
}
tinfoLock.Lock()
tinfoMap[typ] = tinfo
tinfoLock.Unlock()
return tinfo, nil
}
// structFieldInfo builds and returns a fieldInfo for f.
func structFieldInfo(typ reflect.Type, f *reflect.StructField) (*fieldInfo, error) {
finfo := &fieldInfo{idx: f.Index}
// Split the tag from the xml namespace if necessary.
tag := f.Tag.Get("xml")
if i := strings.Index(tag, " "); i >= 0 {
finfo.xmlns, tag = tag[:i], tag[i+1:]
}
// Parse flags.
tokens := strings.Split(tag, ",")
if len(tokens) == 1 {
finfo.flags = fElement
} else {
tag = tokens[0]
for _, flag := range tokens[1:] {
switch flag {
case "attr":
finfo.flags |= fAttr
case "chardata":
finfo.flags |= fCharData
case "innerxml":
finfo.flags |= fInnerXml
case "comment":
finfo.flags |= fComment
case "any":
finfo.flags |= fAny
case "omitempty":
finfo.flags |= fOmitEmpty
}
}
// Validate the flags used.
valid := true
switch mode := finfo.flags & fMode; mode {
case 0:
finfo.flags |= fElement
case fAttr, fCharData, fInnerXml, fComment, fAny:
if f.Name == "XMLName" || tag != "" && mode != fAttr {
valid = false
}
default:
// This will also catch multiple modes in a single field.
valid = false
}
if finfo.flags&fMode == fAny {
finfo.flags |= fElement
}
if finfo.flags&fOmitEmpty != 0 && finfo.flags&(fElement|fAttr) == 0 {
valid = false
}
if !valid {
return nil, fmt.Errorf("xml: invalid tag in field %s of type %s: %q",
f.Name, typ, f.Tag.Get("xml"))
}
}
// Use of xmlns without a name is not allowed.
if finfo.xmlns != "" && tag == "" {
return nil, fmt.Errorf("xml: namespace without name in field %s of type %s: %q",
f.Name, typ, f.Tag.Get("xml"))
}
if f.Name == "XMLName" {
// The XMLName field records the XML element name. Don't
// process it as usual because its name should default to
// empty rather than to the field name.
finfo.name = tag
return finfo, nil
}
if tag == "" {
// If the name part of the tag is completely empty, get
// default from XMLName of underlying struct if feasible,
// or field name otherwise.
if xmlname := lookupXMLName(f.Type); xmlname != nil {
finfo.xmlns, finfo.name = xmlname.xmlns, xmlname.name
} else {
finfo.name = f.Name
}
return finfo, nil
}
if finfo.xmlns == "" && finfo.flags&fAttr == 0 {
// If it's an element no namespace specified, get the default
// from the XMLName of enclosing struct if possible.
if xmlname := lookupXMLName(typ); xmlname != nil {
finfo.xmlns = xmlname.xmlns
}
}
// Prepare field name and parents.
parents := strings.Split(tag, ">")
if parents[0] == "" {
parents[0] = f.Name
}
if parents[len(parents)-1] == "" {
return nil, fmt.Errorf("xml: trailing '>' in field %s of type %s", f.Name, typ)
}
finfo.name = parents[len(parents)-1]
if len(parents) > 1 {
if (finfo.flags & fElement) == 0 {
return nil, fmt.Errorf("xml: %s chain not valid with %s flag", tag, strings.Join(tokens[1:], ","))
}
finfo.parents = parents[:len(parents)-1]
}
// If the field type has an XMLName field, the names must match
// so that the behavior of both marshalling and unmarshalling
// is straightforward and unambiguous.
if finfo.flags&fElement != 0 {
ftyp := f.Type
xmlname := lookupXMLName(ftyp)
if xmlname != nil && xmlname.name != finfo.name {
return nil, fmt.Errorf("xml: name %q in tag of %s.%s conflicts with name %q in %s.XMLName",
finfo.name, typ, f.Name, xmlname.name, ftyp)
}
}
return finfo, nil
}
// lookupXMLName returns the fieldInfo for typ's XMLName field
// in case it exists and has a valid xml field tag, otherwise
// it returns nil.
func lookupXMLName(typ reflect.Type) (xmlname *fieldInfo) {
for typ.Kind() == reflect.Ptr {
typ = typ.Elem()
}
if typ.Kind() != reflect.Struct {
return nil
}
for i, n := 0, typ.NumField(); i < n; i++ {
f := typ.Field(i)
if f.Name != "XMLName" {
continue
}
finfo, err := structFieldInfo(typ, &f)
if finfo.name != "" && err == nil {
return finfo
}
// Also consider errors as a non-existent field tag
// and let getTypeInfo itself report the error.
break
}
return nil
}
func min(a, b int) int {
if a <= b {
return a
}
return b
}
// addFieldInfo adds finfo to tinfo.fields if there are no
// conflicts, or if conflicts arise from previous fields that were
// obtained from deeper embedded structures than finfo. In the latter
// case, the conflicting entries are dropped.
// A conflict occurs when the path (parent + name) to a field is
// itself a prefix of another path, or when two paths match exactly.
// It is okay for field paths to share a common, shorter prefix.
func addFieldInfo(typ reflect.Type, tinfo *typeInfo, newf *fieldInfo) error {
var conflicts []int
Loop:
// First, figure all conflicts. Most working code will have none.
for i := range tinfo.fields {
oldf := &tinfo.fields[i]
if oldf.flags&fMode != newf.flags&fMode {
continue
}
if oldf.xmlns != "" && newf.xmlns != "" && oldf.xmlns != newf.xmlns {
continue
}
minl := min(len(newf.parents), len(oldf.parents))
for p := 0; p < minl; p++ {
if oldf.parents[p] != newf.parents[p] {
continue Loop
}
}
if len(oldf.parents) > len(newf.parents) {
if oldf.parents[len(newf.parents)] == newf.name {
conflicts = append(conflicts, i)
}
} else if len(oldf.parents) < len(newf.parents) {
if newf.parents[len(oldf.parents)] == oldf.name {
conflicts = append(conflicts, i)
}
} else {
if newf.name == oldf.name {
conflicts = append(conflicts, i)
}
}
}
// Without conflicts, add the new field and return.
if conflicts == nil {
tinfo.fields = append(tinfo.fields, *newf)
return nil
}
// If any conflict is shallower, ignore the new field.
// This matches the Go field resolution on embedding.
for _, i := range conflicts {
if len(tinfo.fields[i].idx) < len(newf.idx) {
return nil
}
}
// Otherwise, if any of them is at the same depth level, it's an error.
for _, i := range conflicts {
oldf := &tinfo.fields[i]
if len(oldf.idx) == len(newf.idx) {
f1 := typ.FieldByIndex(oldf.idx)
f2 := typ.FieldByIndex(newf.idx)
return &TagPathError{typ, f1.Name, f1.Tag.Get("xml"), f2.Name, f2.Tag.Get("xml")}
}
}
// Otherwise, the new field is shallower, and thus takes precedence,
// so drop the conflicting fields from tinfo and append the new one.
for c := len(conflicts) - 1; c >= 0; c-- {
i := conflicts[c]
copy(tinfo.fields[i:], tinfo.fields[i+1:])
tinfo.fields = tinfo.fields[:len(tinfo.fields)-1]
}
tinfo.fields = append(tinfo.fields, *newf)
return nil
}
// A TagPathError represents an error in the unmarshalling process
// caused by the use of field tags with conflicting paths.
type TagPathError struct {
Struct reflect.Type
Field1, Tag1 string
Field2, Tag2 string
}
func (e *TagPathError) Error() string {
return fmt.Sprintf("%s field %q with tag %q conflicts with field %q with tag %q", e.Struct, e.Field1, e.Tag1, e.Field2, e.Tag2)
}
// value returns v's field value corresponding to finfo.
// It's equivalent to v.FieldByIndex(finfo.idx), but initializes
// and dereferences pointers as necessary.
func (finfo *fieldInfo) value(v reflect.Value) reflect.Value {
for i, x := range finfo.idx {
if i > 0 {
t := v.Type()
if t.Kind() == reflect.Ptr && t.Elem().Kind() == reflect.Struct {
if v.IsNil() {
v.Set(reflect.New(v.Type().Elem()))
}
v = v.Elem()
}
}
v = v.Field(x)
}
return v
}

1998
code/tool/dav/xml/xml.go Normal file
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