fix: add involves edge from task to agent:nomos at creation
Plus sync vendor directory for Docker build compatibility.
This commit is contained in:
304
vendor/github.com/modelcontextprotocol/go-sdk/oauthex/resource_meta.go
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vendor/github.com/modelcontextprotocol/go-sdk/oauthex/resource_meta.go
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// Copyright 2025 The Go MCP SDK Authors. All rights reserved.
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// Use of this source code is governed by an MIT-style
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// license that can be found in the LICENSE file.
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// This file implements Protected Resource Metadata.
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// See https://www.rfc-editor.org/rfc/rfc9728.html.
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package oauthex
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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"strings"
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"unicode"
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"github.com/modelcontextprotocol/go-sdk/internal/util"
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)
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// ProtectedResourceMetadata is the metadata for an OAuth 2.0 protected resource,
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// as defined in section 2 of https://www.rfc-editor.org/rfc/rfc9728.html.
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//
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// The following features are not supported:
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// - additional keys (§2, last sentence)
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// - human-readable metadata (§2.1)
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// - signed metadata (§2.2)
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type ProtectedResourceMetadata struct {
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// Resource (resource) is the protected resource's resource identifier.
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// Required.
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Resource string `json:"resource"`
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// AuthorizationServers (authorization_servers) is an optional slice containing a list of
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// OAuth authorization server issuer identifiers (as defined in RFC 8414) that can be
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// used with this protected resource.
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AuthorizationServers []string `json:"authorization_servers,omitempty"`
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// JWKSURI (jwks_uri) is an optional URL of the protected resource's JSON Web Key (JWK) Set
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// document. This contains public keys belonging to the protected resource, such as
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// signing key(s) that the resource server uses to sign resource responses.
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JWKSURI string `json:"jwks_uri,omitempty"`
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// ScopesSupported (scopes_supported) is a recommended slice containing a list of scope
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// values (as defined in RFC 6749) used in authorization requests to request access
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// to this protected resource.
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ScopesSupported []string `json:"scopes_supported,omitempty"`
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// BearerMethodsSupported (bearer_methods_supported) is an optional slice containing
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// a list of the supported methods of sending an OAuth 2.0 bearer token to the
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// protected resource. Defined values are "header", "body", and "query".
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BearerMethodsSupported []string `json:"bearer_methods_supported,omitempty"`
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// ResourceSigningAlgValuesSupported (resource_signing_alg_values_supported) is an optional
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// slice of JWS signing algorithms (alg values) supported by the protected
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// resource for signing resource responses.
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ResourceSigningAlgValuesSupported []string `json:"resource_signing_alg_values_supported,omitempty"`
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// ResourceName (resource_name) is a human-readable name of the protected resource
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// intended for display to the end user. It is RECOMMENDED that this field be included.
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// This value may be internationalized.
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ResourceName string `json:"resource_name,omitempty"`
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// ResourceDocumentation (resource_documentation) is an optional URL of a page containing
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// human-readable information for developers using the protected resource.
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// This value may be internationalized.
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ResourceDocumentation string `json:"resource_documentation,omitempty"`
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// ResourcePolicyURI (resource_policy_uri) is an optional URL of a page containing
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// human-readable policy information on how a client can use the data provided.
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// This value may be internationalized.
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ResourcePolicyURI string `json:"resource_policy_uri,omitempty"`
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// ResourceTOSURI (resource_tos_uri) is an optional URL of a page containing the protected
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// resource's human-readable terms of service. This value may be internationalized.
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ResourceTOSURI string `json:"resource_tos_uri,omitempty"`
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// TLSClientCertificateBoundAccessTokens (tls_client_certificate_bound_access_tokens) is an
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// optional boolean indicating support for mutual-TLS client certificate-bound
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// access tokens (RFC 8705). Defaults to false if omitted.
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TLSClientCertificateBoundAccessTokens bool `json:"tls_client_certificate_bound_access_tokens,omitempty"`
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// AuthorizationDetailsTypesSupported (authorization_details_types_supported) is an optional
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// slice of 'type' values supported by the resource server for the
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// 'authorization_details' parameter (RFC 9396).
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AuthorizationDetailsTypesSupported []string `json:"authorization_details_types_supported,omitempty"`
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// DPOPSigningAlgValuesSupported (dpop_signing_alg_values_supported) is an optional
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// slice of JWS signing algorithms supported by the resource server for validating
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// DPoP proof JWTs (RFC 9449).
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DPOPSigningAlgValuesSupported []string `json:"dpop_signing_alg_values_supported,omitempty"`
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// DPOPBoundAccessTokensRequired (dpop_bound_access_tokens_required) is an optional boolean
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// specifying whether the protected resource always requires the use of DPoP-bound
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// access tokens (RFC 9449). Defaults to false if omitted.
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DPOPBoundAccessTokensRequired bool `json:"dpop_bound_access_tokens_required,omitempty"`
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// SignedMetadata (signed_metadata) is an optional JWT containing metadata parameters
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// about the protected resource as claims. If present, these values take precedence
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// over values conveyed in plain JSON.
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// TODO:implement.
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// Note that §2.2 says it's okay to ignore this.
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// SignedMetadata string `json:"signed_metadata,omitempty"`
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}
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// Challenge represents a single authentication challenge from a WWW-Authenticate header.
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// As per RFC 9110, Section 11.6.1, a challenge consists of a scheme and optional parameters.
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type Challenge struct {
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// Scheme is the authentication scheme (e.g., "Bearer", "Basic").
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// It is case-insensitive. A parsed value will always be lower-case.
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Scheme string
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// Params is a map of authentication parameters.
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// Keys are case-insensitive. Parsed keys are always lower-case.
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Params map[string]string
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}
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// GetProtectedResourceMetadata issues a GET request to retrieve protected resource
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// metadata from a resource server.
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// The metadataURL is typically a URL with a host:port and possibly a path.
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// The resourceURL is the resource URI the metadataURL is for.
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// The following checks are performed:
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// - The metadataURL must use HTTPS or be a local address.
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// - The resource field of the resulting metadata must match the resourceURL.
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// - The authorization_servers field of the resulting metadata is checked for dangerous URL schemes.
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func GetProtectedResourceMetadata(ctx context.Context, metadataURL, resourceURL string, c *http.Client) (_ *ProtectedResourceMetadata, err error) {
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defer util.Wrapf(&err, "GetProtectedResourceMetadata(%q)", metadataURL)
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// Only allow HTTP for local addresses (testing or development purposes).
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if err := checkHTTPSOrLoopback(metadataURL); err != nil {
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return nil, fmt.Errorf("metadataURL: %v", err)
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}
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prm, err := getJSON[ProtectedResourceMetadata](ctx, c, metadataURL, 1<<20)
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if err != nil {
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return nil, err
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}
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// Validate the Resource field (see RFC 9728, section 3.3).
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if prm.Resource != resourceURL {
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return nil, fmt.Errorf("got metadata resource %q, want %q", prm.Resource, resourceURL)
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}
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// Validate the authorization server URLs to prevent XSS attacks (see #526).
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for i, u := range prm.AuthorizationServers {
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if err := checkURLScheme(u); err != nil {
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return nil, fmt.Errorf("authorization_servers[%d]: %v", i, err)
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}
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if err := checkHTTPSOrLoopback(u); err != nil {
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return nil, fmt.Errorf("authorization_servers[%d]: %v", i, err)
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}
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}
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return prm, nil
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}
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// ParseWWWAuthenticate parses a WWW-Authenticate header string.
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// The header format is defined in RFC 9110, Section 11.6.1, and can contain
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// one or more challenges, separated by commas.
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// It returns a slice of challenges or an error if one of the headers is malformed.
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func ParseWWWAuthenticate(headers []string) ([]Challenge, error) {
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var challenges []Challenge
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for _, h := range headers {
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challengeStrings, err := splitChallenges(h)
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if err != nil {
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return nil, err
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}
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for _, cs := range challengeStrings {
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if strings.TrimSpace(cs) == "" {
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continue
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}
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challenge, err := parseSingleChallenge(cs)
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if err != nil {
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return nil, fmt.Errorf("failed to parse challenge %q: %w", cs, err)
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}
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challenges = append(challenges, challenge)
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}
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}
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return challenges, nil
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}
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// splitChallenges splits a header value containing one or more challenges.
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// It correctly handles commas within quoted strings and distinguishes between
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// commas separating auth-params and commas separating challenges.
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func splitChallenges(header string) ([]string, error) {
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var challenges []string
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inQuotes := false
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start := 0
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for i, r := range header {
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if r == '"' {
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if i > 0 && header[i-1] != '\\' {
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inQuotes = !inQuotes
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} else if i == 0 {
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// A challenge begins with an auth-scheme, which is a token, which cannot contain
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// a quote.
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return nil, errors.New(`challenge begins with '"'`)
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}
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} else if r == ',' && !inQuotes {
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// This is a potential challenge separator.
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// A new challenge does not start with `key=value`.
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// We check if the part after the comma looks like a parameter.
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lookahead := strings.TrimSpace(header[i+1:])
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eqPos := strings.Index(lookahead, "=")
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isParam := false
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if eqPos > 0 {
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// Check if the part before '=' is a single token (no spaces).
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token := lookahead[:eqPos]
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if strings.IndexFunc(token, unicode.IsSpace) == -1 {
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isParam = true
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}
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}
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if !isParam {
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// The part after the comma does not look like a parameter,
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// so this comma separates challenges.
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challenges = append(challenges, header[start:i])
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start = i + 1
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}
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}
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}
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// Add the last (or only) challenge to the list.
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challenges = append(challenges, header[start:])
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return challenges, nil
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}
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// parseSingleChallenge parses a string containing exactly one challenge.
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// challenge = auth-scheme [ 1*SP ( token68 / #auth-param ) ]
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func parseSingleChallenge(s string) (Challenge, error) {
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s = strings.TrimSpace(s)
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if s == "" {
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return Challenge{}, errors.New("empty challenge string")
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}
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scheme, paramsStr, found := strings.Cut(s, " ")
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c := Challenge{Scheme: strings.ToLower(scheme)}
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if !found {
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return c, nil
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}
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params := make(map[string]string)
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// Parse the key-value parameters.
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for paramsStr != "" {
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// Find the end of the parameter key.
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keyEnd := strings.Index(paramsStr, "=")
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if keyEnd <= 0 {
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return Challenge{}, fmt.Errorf("malformed auth parameter: expected key=value, but got %q", paramsStr)
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}
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key := strings.TrimSpace(paramsStr[:keyEnd])
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// Move the string past the key and the '='.
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paramsStr = strings.TrimSpace(paramsStr[keyEnd+1:])
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var value string
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if strings.HasPrefix(paramsStr, "\"") {
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// The value is a quoted string.
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paramsStr = paramsStr[1:] // Consume the opening quote.
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var valBuilder strings.Builder
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i := 0
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for ; i < len(paramsStr); i++ {
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// Handle escaped characters.
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if paramsStr[i] == '\\' && i+1 < len(paramsStr) {
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valBuilder.WriteByte(paramsStr[i+1])
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i++ // We've consumed two characters.
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} else if paramsStr[i] == '"' {
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// End of the quoted string.
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break
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} else {
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valBuilder.WriteByte(paramsStr[i])
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}
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}
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// A quoted string must be terminated.
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if i == len(paramsStr) {
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return Challenge{}, fmt.Errorf("unterminated quoted string in auth parameter")
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}
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value = valBuilder.String()
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// Move the string past the value and the closing quote.
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paramsStr = strings.TrimSpace(paramsStr[i+1:])
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} else {
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// The value is a token. It ends at the next comma or the end of the string.
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commaPos := strings.Index(paramsStr, ",")
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if commaPos == -1 {
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value = paramsStr
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paramsStr = ""
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} else {
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value = strings.TrimSpace(paramsStr[:commaPos])
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paramsStr = strings.TrimSpace(paramsStr[commaPos:]) // Keep comma for next check
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}
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}
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if value == "" {
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return Challenge{}, fmt.Errorf("no value for auth param %q", key)
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}
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// Per RFC 9110, parameter keys are case-insensitive.
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params[strings.ToLower(key)] = value
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// If there is a comma, consume it and continue to the next parameter.
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if strings.HasPrefix(paramsStr, ",") {
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paramsStr = strings.TrimSpace(paramsStr[1:])
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} else if paramsStr != "" {
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// If there's content but it's not a new parameter, the format is wrong.
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return Challenge{}, fmt.Errorf("malformed auth parameter: expected comma after value, but got %q", paramsStr)
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}
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}
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// Per RFC 9110, the scheme is case-insensitive.
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return Challenge{Scheme: strings.ToLower(scheme), Params: params}, nil
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}
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