| 1 | package mcpdiag |
| 2 | |
| 3 | import ( |
| 4 | "net/url" |
| 5 | "strings" |
| 6 | ) |
| 7 | |
| 8 | const ( |
| 9 | AuthNone = "none" |
| 10 | AuthPossible = "possible" |
| 11 | AuthRequired = "required" |
| 12 | ) |
| 13 | |
| 14 | type AuthDiagnosis struct { |
| 15 | Status string |
| 16 | URL string |
| 17 | } |
| 18 | |
| 19 | func DiagnoseAuth(transport, status, errText, url string, authConfigured bool) AuthDiagnosis { |
| 20 | if IsAuthFailure(errText) { |
| 21 | return AuthDiagnosis{Status: AuthRequired, URL: remoteAuthURL(transport, url)} |
| 22 | } |
| 23 | if authConfigured || !isRemoteTransport(transport) || !looksLikeHTTPURL(url) || strings.TrimSpace(errText) != "" { |
| 24 | return AuthDiagnosis{Status: AuthNone} |
| 25 | } |
| 26 | switch strings.ToLower(strings.TrimSpace(status)) { |
| 27 | case "connected", "failed": |
| 28 | return AuthDiagnosis{Status: AuthNone} |
| 29 | case "deferred", "initializing", "disabled": |
| 30 | return AuthDiagnosis{Status: AuthPossible, URL: strings.TrimSpace(url)} |
| 31 | default: |
| 32 | return AuthDiagnosis{Status: AuthNone} |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | func IsAuthFailure(errText string) bool { |
| 37 | lower := strings.ToLower(errText) |
| 38 | for _, needle := range []string{ |
| 39 | "401", |
| 40 | "403", |
| 41 | "unauthorized", |
| 42 | "forbidden", |
| 43 | "invalid token", |
| 44 | "login required", |
| 45 | "authentication", |
| 46 | "not authenticated", |
| 47 | } { |
| 48 | if strings.Contains(lower, needle) { |
| 49 | return true |
| 50 | } |
| 51 | } |
| 52 | return false |
| 53 | } |
| 54 | |
| 55 | func HasAuthConfig(headers, env map[string]string, url string) bool { |
| 56 | for k, v := range headers { |
| 57 | if strings.TrimSpace(k) == "" { |
| 58 | continue |
| 59 | } |
| 60 | if strings.TrimSpace(v) != "" && (isAuthish(k) || containsExplicitAuthMaterial(v)) { |
| 61 | return true |
| 62 | } |
| 63 | } |
| 64 | if containsAuthMaterial(url) { |
| 65 | return true |
| 66 | } |
| 67 | for k, v := range env { |
| 68 | if strings.TrimSpace(v) == "" { |
| 69 | continue |
| 70 | } |
| 71 | if isAuthish(k) || containsAuthMaterial(v) { |
| 72 | return true |
| 73 | } |
| 74 | } |
| 75 | return false |
| 76 | } |
| 77 | |
| 78 | func ClearAuthConfig(headers, env map[string]string, rawURL string) (map[string]string, map[string]string, string, bool) { |
| 79 | cleanHeaders, changedHeaders := clearAuthMap(headers) |
| 80 | cleanEnv, changedEnv := clearAuthMap(env) |
| 81 | cleanURL, changedURL := clearAuthURL(rawURL) |
| 82 | return cleanHeaders, cleanEnv, cleanURL, changedHeaders || changedEnv || changedURL |
| 83 | } |
| 84 | |
| 85 | func IsRemoteTransport(transport string) bool { |
| 86 | return isRemoteTransport(transport) |
| 87 | } |
| 88 | |
| 89 | func remoteAuthURL(transport, url string) string { |
| 90 | if !isRemoteTransport(transport) || !looksLikeHTTPURL(url) { |
| 91 | return "" |
| 92 | } |
| 93 | return strings.TrimSpace(url) |
| 94 | } |
| 95 | |
| 96 | func isRemoteTransport(transport string) bool { |
| 97 | switch strings.ToLower(strings.TrimSpace(transport)) { |
| 98 | case "http", "streamable-http", "sse": |
| 99 | return true |
| 100 | default: |
| 101 | return false |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | func looksLikeHTTPURL(url string) bool { |
| 106 | u := strings.ToLower(strings.TrimSpace(url)) |
| 107 | return strings.HasPrefix(u, "https://") || strings.HasPrefix(u, "http://") |
| 108 | } |
| 109 | |
| 110 | func containsAuthMaterial(s string) bool { |
| 111 | lower := strings.ToLower(s) |
| 112 | return strings.Contains(lower, "${") || containsExplicitAuthMaterial(lower) |
| 113 | } |
| 114 | |
| 115 | func containsExplicitAuthMaterial(s string) bool { |
| 116 | lower := strings.ToLower(s) |
| 117 | return strings.Contains(lower, "access_token") || |
| 118 | strings.Contains(lower, "id_token") || |
| 119 | strings.Contains(lower, "refresh_token") || |
| 120 | strings.Contains(lower, "api_key") || |
| 121 | strings.Contains(lower, "api-key") || |
| 122 | strings.Contains(lower, "apikey") || |
| 123 | strings.Contains(lower, "bearer ") |
| 124 | } |
| 125 | |
| 126 | func isAuthish(key string) bool { |
| 127 | lower := strings.ToLower(strings.TrimSpace(key)) |
| 128 | return strings.Contains(lower, "auth") || |
| 129 | strings.Contains(lower, "token") || |
| 130 | strings.Contains(lower, "secret") || |
| 131 | strings.Contains(lower, "credential") || |
| 132 | strings.Contains(lower, "api_key") || |
| 133 | strings.Contains(lower, "api-key") || |
| 134 | strings.Contains(lower, "apikey") || |
| 135 | strings.Contains(lower, "cookie") |
| 136 | } |
| 137 | |
| 138 | func clearAuthMap(in map[string]string) (map[string]string, bool) { |
| 139 | if len(in) == 0 { |
| 140 | return nil, false |
| 141 | } |
| 142 | out := make(map[string]string, len(in)) |
| 143 | changed := false |
| 144 | for k, v := range in { |
| 145 | if isAuthish(k) || containsExplicitAuthMaterial(v) { |
| 146 | changed = true |
| 147 | continue |
| 148 | } |
| 149 | out[k] = v |
| 150 | } |
| 151 | if len(out) == 0 { |
| 152 | out = nil |
| 153 | } |
| 154 | return out, changed |
| 155 | } |
| 156 | |
| 157 | func clearAuthURL(raw string) (string, bool) { |
| 158 | trimmed := strings.TrimSpace(raw) |
| 159 | if !looksLikeHTTPURL(trimmed) { |
| 160 | return raw, false |
| 161 | } |
| 162 | u, err := url.Parse(trimmed) |
| 163 | if err != nil || u == nil { |
| 164 | return raw, false |
| 165 | } |
| 166 | q := u.Query() |
| 167 | changed := false |
| 168 | for key := range q { |
| 169 | if isAuthQueryKey(key) { |
| 170 | q.Del(key) |
| 171 | changed = true |
| 172 | } |
| 173 | } |
| 174 | if !changed { |
| 175 | return raw, false |
| 176 | } |
| 177 | u.RawQuery = q.Encode() |
| 178 | return u.String(), true |
| 179 | } |
| 180 | |
| 181 | func isAuthQueryKey(key string) bool { |
| 182 | lower := strings.ToLower(strings.TrimSpace(key)) |
| 183 | return lower == "key" || isAuthish(lower) |
| 184 | } |
| 185 |