| 1 | package mcpdiag |
| 2 | |
| 3 | import ( |
| 4 | "net" |
| 5 | "net/url" |
| 6 | "strings" |
| 7 | ) |
| 8 | |
| 9 | const ( |
| 10 | AuthNone = "none" |
| 11 | AuthPossible = "possible" |
| 12 | AuthRequired = "required" |
| 13 | ) |
| 14 | |
| 15 | type AuthDiagnosis struct { |
| 16 | Status string |
| 17 | URL string |
| 18 | } |
| 19 | |
| 20 | func DiagnoseAuth(transport, status, errText, url string, authConfigured bool) AuthDiagnosis { |
| 21 | eligible := CanUseHTTPMCPOAuth(transport, url, authConfigured) |
| 22 | if IsAuthFailure(errText) { |
| 23 | if eligible { |
| 24 | return AuthDiagnosis{Status: AuthRequired, URL: strings.TrimSpace(url)} |
| 25 | } |
| 26 | return AuthDiagnosis{Status: AuthNone} |
| 27 | } |
| 28 | if !eligible || strings.TrimSpace(errText) != "" { |
| 29 | return AuthDiagnosis{Status: AuthNone} |
| 30 | } |
| 31 | switch strings.ToLower(strings.TrimSpace(status)) { |
| 32 | case "connected", "failed": |
| 33 | return AuthDiagnosis{Status: AuthNone} |
| 34 | case "deferred", "initializing", "disabled": |
| 35 | return AuthDiagnosis{Status: AuthPossible, URL: strings.TrimSpace(url)} |
| 36 | default: |
| 37 | return AuthDiagnosis{Status: AuthNone} |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | // CanUseHTTPMCPOAuth reports whether Reasonix's native authorization-code flow |
| 42 | // can own authentication for this server. Legacy SSE, stdio, malformed URLs, |
| 43 | // and configurations with explicit credentials must keep their normal retry |
| 44 | // or credential-management path. |
| 45 | func CanUseHTTPMCPOAuth(transport, url string, authConfigured bool) bool { |
| 46 | if authConfigured || HasAuthConfig(nil, nil, url) || !looksLikeNativeOAuthURL(url) { |
| 47 | return false |
| 48 | } |
| 49 | switch strings.ToLower(strings.TrimSpace(transport)) { |
| 50 | case "http", "streamable-http", "streamable_http": |
| 51 | return true |
| 52 | default: |
| 53 | return false |
| 54 | } |
| 55 | } |
| 56 | |
| 57 | // HTTPMCPOAuthResource returns the resource URL that native OAuth may own, or |
| 58 | // an empty string when the configured transport/auth boundary belongs elsewhere. |
| 59 | func HTTPMCPOAuthResource(transport, url string, authConfigured bool) string { |
| 60 | if !CanUseHTTPMCPOAuth(transport, url, authConfigured) { |
| 61 | return "" |
| 62 | } |
| 63 | return strings.TrimSpace(url) |
| 64 | } |
| 65 | |
| 66 | func IsAuthFailure(errText string) bool { |
| 67 | lower := strings.ToLower(errText) |
| 68 | for _, needle := range []string{ |
| 69 | "401", |
| 70 | "403", |
| 71 | "unauthorized", |
| 72 | "forbidden", |
| 73 | "invalid token", |
| 74 | "login required", |
| 75 | "authentication", |
| 76 | "not authenticated", |
| 77 | } { |
| 78 | if strings.Contains(lower, needle) { |
| 79 | return true |
| 80 | } |
| 81 | } |
| 82 | return false |
| 83 | } |
| 84 | |
| 85 | func HasAuthConfig(headers, env map[string]string, url string) bool { |
| 86 | for k, v := range headers { |
| 87 | if strings.TrimSpace(k) == "" { |
| 88 | continue |
| 89 | } |
| 90 | if strings.TrimSpace(v) != "" && (isAuthish(k) || containsExplicitAuthMaterial(v)) { |
| 91 | return true |
| 92 | } |
| 93 | } |
| 94 | if urlHasAuthConfig(url) { |
| 95 | return true |
| 96 | } |
| 97 | for k, v := range env { |
| 98 | if strings.TrimSpace(v) == "" { |
| 99 | continue |
| 100 | } |
| 101 | if isAuthish(k) || containsAuthMaterial(v) { |
| 102 | return true |
| 103 | } |
| 104 | } |
| 105 | return false |
| 106 | } |
| 107 | |
| 108 | func ClearAuthConfig(headers, env map[string]string, rawURL string) (map[string]string, map[string]string, string, bool) { |
| 109 | cleanHeaders, changedHeaders := clearAuthMap(headers) |
| 110 | cleanEnv, changedEnv := clearAuthMap(env) |
| 111 | cleanURL, changedURL := clearAuthURL(rawURL) |
| 112 | return cleanHeaders, cleanEnv, cleanURL, changedHeaders || changedEnv || changedURL |
| 113 | } |
| 114 | |
| 115 | func IsRemoteTransport(transport string) bool { |
| 116 | return isRemoteTransport(transport) |
| 117 | } |
| 118 | |
| 119 | func isRemoteTransport(transport string) bool { |
| 120 | switch strings.ToLower(strings.TrimSpace(transport)) { |
| 121 | case "http", "streamable-http", "sse": |
| 122 | return true |
| 123 | default: |
| 124 | return false |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | func looksLikeHTTPURL(rawURL string) bool { |
| 129 | u, err := url.Parse(strings.TrimSpace(rawURL)) |
| 130 | if err != nil || u == nil || strings.TrimSpace(u.Host) == "" { |
| 131 | return false |
| 132 | } |
| 133 | return strings.EqualFold(u.Scheme, "https") || strings.EqualFold(u.Scheme, "http") |
| 134 | } |
| 135 | |
| 136 | func looksLikeNativeOAuthURL(rawURL string) bool { |
| 137 | u, err := url.Parse(strings.TrimSpace(rawURL)) |
| 138 | if err != nil || u == nil || strings.TrimSpace(u.Host) == "" || u.User != nil || u.Fragment != "" { |
| 139 | return false |
| 140 | } |
| 141 | if strings.EqualFold(u.Scheme, "https") { |
| 142 | return true |
| 143 | } |
| 144 | return strings.EqualFold(u.Scheme, "http") && isLoopbackHost(u.Hostname()) |
| 145 | } |
| 146 | |
| 147 | func isLoopbackHost(host string) bool { |
| 148 | host = strings.Trim(strings.ToLower(strings.TrimSpace(host)), "[]") |
| 149 | return host == "localhost" || (net.ParseIP(host) != nil && net.ParseIP(host).IsLoopback()) |
| 150 | } |
| 151 | |
| 152 | func containsAuthMaterial(s string) bool { |
| 153 | lower := strings.ToLower(s) |
| 154 | return strings.Contains(lower, "${") || containsExplicitAuthMaterial(lower) |
| 155 | } |
| 156 | |
| 157 | func containsExplicitAuthMaterial(s string) bool { |
| 158 | lower := strings.ToLower(s) |
| 159 | return strings.Contains(lower, "access_token") || |
| 160 | strings.Contains(lower, "id_token") || |
| 161 | strings.Contains(lower, "refresh_token") || |
| 162 | strings.Contains(lower, "api_key") || |
| 163 | strings.Contains(lower, "api-key") || |
| 164 | strings.Contains(lower, "apikey") || |
| 165 | strings.Contains(lower, "bearer ") |
| 166 | } |
| 167 | |
| 168 | func isAuthish(key string) bool { |
| 169 | lower := strings.ToLower(strings.TrimSpace(key)) |
| 170 | return strings.Contains(lower, "auth") || |
| 171 | strings.Contains(lower, "token") || |
| 172 | strings.Contains(lower, "secret") || |
| 173 | strings.Contains(lower, "credential") || |
| 174 | strings.Contains(lower, "api_key") || |
| 175 | strings.Contains(lower, "api-key") || |
| 176 | strings.Contains(lower, "apikey") || |
| 177 | strings.Contains(lower, "subscription-key") || |
| 178 | strings.Contains(lower, "subscription_key") || |
| 179 | strings.Contains(lower, "signature") || |
| 180 | strings.Contains(lower, "hmac") || |
| 181 | strings.Contains(lower, "cookie") |
| 182 | } |
| 183 | |
| 184 | func clearAuthMap(in map[string]string) (map[string]string, bool) { |
| 185 | if len(in) == 0 { |
| 186 | return nil, false |
| 187 | } |
| 188 | out := make(map[string]string, len(in)) |
| 189 | changed := false |
| 190 | for k, v := range in { |
| 191 | if isAuthish(k) || containsExplicitAuthMaterial(v) { |
| 192 | changed = true |
| 193 | continue |
| 194 | } |
| 195 | out[k] = v |
| 196 | } |
| 197 | if len(out) == 0 { |
| 198 | out = nil |
| 199 | } |
| 200 | return out, changed |
| 201 | } |
| 202 | |
| 203 | func clearAuthURL(raw string) (string, bool) { |
| 204 | trimmed := strings.TrimSpace(raw) |
| 205 | if !looksLikeHTTPURL(trimmed) { |
| 206 | return raw, false |
| 207 | } |
| 208 | u, err := url.Parse(trimmed) |
| 209 | if err != nil || u == nil { |
| 210 | return raw, false |
| 211 | } |
| 212 | q := u.Query() |
| 213 | changed := u.User != nil |
| 214 | u.User = nil |
| 215 | for key := range q { |
| 216 | if isAuthQueryKey(key) { |
| 217 | q.Del(key) |
| 218 | changed = true |
| 219 | } |
| 220 | } |
| 221 | if !changed { |
| 222 | return raw, false |
| 223 | } |
| 224 | u.RawQuery = q.Encode() |
| 225 | return u.String(), true |
| 226 | } |
| 227 | |
| 228 | func isAuthQueryKey(key string) bool { |
| 229 | normalized := strings.NewReplacer("-", "", "_", "", " ", "").Replace(strings.ToLower(strings.TrimSpace(key))) |
| 230 | switch normalized { |
| 231 | case "auth", "authorization", "bearer", "credential", "credentials", "key", "sig", "signature", "hmac", "token", "accesstoken", "idtoken", "refreshtoken", "apikey", "accesskey", "secretkey", "subscriptionkey", "clientsecret", "password", "passwd": |
| 232 | return true |
| 233 | } |
| 234 | for _, suffix := range []string{"token", "secret", "password", "passwd", "apikey", "signature"} { |
| 235 | if strings.HasSuffix(normalized, suffix) { |
| 236 | return true |
| 237 | } |
| 238 | } |
| 239 | return false |
| 240 | } |
| 241 | |
| 242 | func urlHasAuthConfig(raw string) bool { |
| 243 | trimmed := strings.TrimSpace(raw) |
| 244 | u, err := url.Parse(trimmed) |
| 245 | if err == nil && u != nil { |
| 246 | if u.User != nil { |
| 247 | return true |
| 248 | } |
| 249 | for key := range u.Query() { |
| 250 | if isAuthQueryKey(key) { |
| 251 | return true |
| 252 | } |
| 253 | } |
| 254 | } |
| 255 | return containsAuthMaterial(trimmed) |
| 256 | } |
| 257 |