forked from mirror/jwt
82 lines
2.3 KiB
Go
82 lines
2.3 KiB
Go
package request
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import (
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"errors"
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"net/http"
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)
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// Errors
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var (
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ErrNoTokenInRequest = errors.New("no token present in request")
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)
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// Extractor is an interface for extracting a token from an HTTP request.
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// The ExtractToken method should return a token string or an error.
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// If no token is present, you must return ErrNoTokenInRequest.
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type Extractor interface {
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ExtractToken(*http.Request) (string, error)
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}
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// HeaderExtractor is an extractor for finding a token in a header.
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// Looks at each specified header in order until there's a match
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type HeaderExtractor []string
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func (e HeaderExtractor) ExtractToken(req *http.Request) (string, error) {
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// loop over header names and return the first one that contains data
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for _, header := range e {
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if ah := req.Header.Get(header); ah != "" {
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return ah, nil
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}
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}
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return "", ErrNoTokenInRequest
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}
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// ArgumentExtractor extracts a token from request arguments. This includes a POSTed form or
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// GET URL arguments. Argument names are tried in order until there's a match.
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// This extractor calls `ParseMultipartForm` on the request
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type ArgumentExtractor []string
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func (e ArgumentExtractor) ExtractToken(req *http.Request) (string, error) {
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// Make sure form is parsed
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req.ParseMultipartForm(10e6)
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// loop over arg names and return the first one that contains data
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for _, arg := range e {
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if ah := req.Form.Get(arg); ah != "" {
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return ah, nil
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}
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}
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return "", ErrNoTokenInRequest
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}
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// MultiExtractor tries Extractors in order until one returns a token string or an error occurs
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type MultiExtractor []Extractor
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func (e MultiExtractor) ExtractToken(req *http.Request) (string, error) {
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// loop over header names and return the first one that contains data
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for _, extractor := range e {
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if tok, err := extractor.ExtractToken(req); tok != "" {
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return tok, nil
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} else if err != ErrNoTokenInRequest {
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return "", err
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}
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}
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return "", ErrNoTokenInRequest
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}
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// PostExtractionFilter wraps an Extractor in this to post-process the value before it's handed off.
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// See AuthorizationHeaderExtractor for an example
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type PostExtractionFilter struct {
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Extractor
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Filter func(string) (string, error)
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}
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func (e *PostExtractionFilter) ExtractToken(req *http.Request) (string, error) {
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if tok, err := e.Extractor.ExtractToken(req); tok != "" {
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return e.Filter(tok)
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} else {
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return "", err
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}
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}
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