webdav

Documentation

Overview

Package webdav provides a WebDAV server implementation.

Index

• Constants
• Variables
• func StatusText(code int) string
• type Condition
• type ContentTyper
• type DeadPropsHolder
• type ETager
• type Handler
  • func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request)
• type LockDetails
• type LockSystem
  • func NewMemLS() LockSystem
• type Property
• type Proppatch
• type Propstat

Constants

const (
	StatusMulti               = 207
	StatusUnprocessableEntity = 422
	StatusLocked              = 423
	StatusFailedDependency    = 424
	StatusInsufficientStorage = 507
)

http://www.webdav.org/specs/rfc4918.html#status.code.extensions.to.http11

Variables

var (
	// ErrConfirmationFailed is returned by a LockSystem's Confirm method.
	ErrConfirmationFailed = errors.New("webdav: confirmation failed")
	// ErrForbidden is returned by a LockSystem's Unlock method.
	ErrForbidden = errors.New("webdav: forbidden")
	// ErrLocked is returned by a LockSystem's Create, Refresh and Unlock methods.
	ErrLocked = errors.New("webdav: locked")
	// ErrNoSuchLock is returned by a LockSystem's Refresh and Unlock methods.
	ErrNoSuchLock = errors.New("webdav: no such lock")
)

var ErrNotImplemented = errors.New("not implemented")

ErrNotImplemented should be returned by optional interfaces if they want the original implementation to be used.

Functions

func StatusText

func StatusText(code int) string

Types

type Condition

type Condition struct {
	Not   bool
	Token string
	ETag  string
}

Condition can match a WebDAV resource, based on a token or ETag. Exactly one of Token and ETag should be non-empty.

type ContentTyper

type ContentTyper interface {
	// ContentType returns the content type for the file.
	//
	// If this returns error ErrNotImplemented then the error will
	// be ignored and the base implementation will be used
	// instead.
	ContentType(ctx context.Context) (string, error)
}

ContentTyper is an optional interface for the os.FileInfo objects returned by the FileSystem.

If this interface is defined then it will be used to read the content type from the object.

If this interface is not defined the file will be opened and the content type will be guessed from the initial contents of the file.

type DeadPropsHolder

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)
}

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 ETager

type ETager interface {
	// ETag returns an ETag for the file.  This should be of the
	// form "value" or W/"value"
	//
	// If this returns error ErrNotImplemented then the error will
	// be ignored and the base implementation will be used
	// instead.
	ETag(ctx context.Context) (string, error)
}

ETager is an optional interface for the os.FileInfo objects returned by the FileSystem.

If this interface is defined then it will be used to read the ETag for the object.

If this interface is not defined an ETag will be computed using the ModTime() and the Size() methods of the os.FileInfo object.

type Handler

type Handler struct {
	// Prefix is the URL path prefix to strip from WebDAV resource paths.
	Prefix string
	// LockSystem is the lock management system.
	LockSystem LockSystem
	// Logger is an optional error logger. If non-nil, it will be called
	// for all HTTP requests.
	Logger func(*http.Request, error)
}

func (*Handler) ServeHTTP

func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request)

type LockDetails

type LockDetails struct {
	// Root is the root resource name being locked. For a zero-depth lock, the
	// root is the only resource being locked.
	Root string
	// Duration is the lock timeout. A negative duration means infinite.
	Duration time.Duration
	// OwnerXML is the verbatim <owner> XML given in a LOCK HTTP request.
	//
	// TODO: does the "verbatim" nature play well with XML namespaces?
	// Does the OwnerXML field need to have more structure? See
	// https://codereview.appspot.com/175140043/#msg2
	OwnerXML string
	// ZeroDepth is whether the lock has zero depth. If it does not have zero
	// depth, it has infinite depth.
	ZeroDepth bool
}

LockDetails are a lock's metadata.

type LockSystem

type LockSystem interface {
	// Confirm confirms that the caller can claim all of the locks specified by
	// the given conditions, and that holding the union of all of those locks
	// gives exclusive access to all of the named resources. Up to two resources
	// can be named. Empty names are ignored.
	//
	// Exactly one of release and err will be non-nil. If release is non-nil,
	// all of the requested locks are held until release is called. Calling
	// release does not unlock the lock, in the WebDAV UNLOCK sense, but once
	// Confirm has confirmed that a lock claim is valid, that lock cannot be
	// Confirmed again until it has been released.
	//
	// If Confirm returns ErrConfirmationFailed then the Handler will continue
	// to try any other set of locks presented (a WebDAV HTTP request can
	// present more than one set of locks). If it returns any other non-nil
	// error, the Handler will write a "500 Internal Server Error" HTTP status.
	Confirm(now time.Time, name0, name1 string, conditions ...Condition) (release func(), err error)

	// Create creates a lock with the given depth, duration, owner and root
	// (name). The depth will either be negative (meaning infinite) or zero.
	//
	// If Create returns ErrLocked then the Handler will write a "423 Locked"
	// HTTP status. If it returns any other non-nil error, the Handler will
	// write a "500 Internal Server Error" HTTP status.
	//
	// See http://www.webdav.org/specs/rfc4918.html#rfc.section.9.10.6 for
	// when to use each error.
	//
	// The token returned identifies the created lock. It should be an absolute
	// URI as defined by RFC 3986, Section 4.3. In particular, it should not
	// contain whitespace.
	Create(now time.Time, details LockDetails) (token string, err error)

	// Refresh refreshes the lock with the given token.
	//
	// If Refresh returns ErrLocked then the Handler will write a "423 Locked"
	// HTTP Status. If Refresh returns ErrNoSuchLock then the Handler will write
	// a "412 Precondition Failed" HTTP Status. If it returns any other non-nil
	// error, the Handler will write a "500 Internal Server Error" HTTP status.
	//
	// See http://www.webdav.org/specs/rfc4918.html#rfc.section.9.10.6 for
	// when to use each error.
	Refresh(now time.Time, token string, duration time.Duration) (LockDetails, error)

	// Unlock unlocks the lock with the given token.
	//
	// If Unlock returns ErrForbidden then the Handler will write a "403
	// Forbidden" HTTP Status. If Unlock returns ErrLocked then the Handler
	// will write a "423 Locked" HTTP status. If Unlock returns ErrNoSuchLock
	// then the Handler will write a "409 Conflict" HTTP Status. If it returns
	// any other non-nil error, the Handler will write a "500 Internal Server
	// Error" HTTP status.
	//
	// See http://www.webdav.org/specs/rfc4918.html#rfc.section.9.11.1 for
	// when to use each error.
	Unlock(now time.Time, token string) error
}

LockSystem manages access to a collection of named resources. The elements in a lock name are separated by slash ('/', U+002F) characters, regardless of host operating system convention.

func NewMemLS

func NewMemLS() LockSystem

NewMemLS returns a new in-memory LockSystem.

type Property

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"`
}

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 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
}

Proppatch describes a property update instruction as defined in RFC 4918. See http://www.webdav.org/specs/rfc4918.html#METHOD_PROPPATCH

type 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
}

Propstat describes a XML propstat element as defined in RFC 4918. See http://www.webdav.org/specs/rfc4918.html#ELEMENT_propstat