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| 1 | +import pkceChallenge from "pkce-challenge"; |
| 2 | +import { SESSION_KEYS } from "./constants"; |
| 3 | +import { z } from "zod"; |
| 4 | + |
| 5 | +export const OAuthMetadataSchema = z.object({ |
| 6 | + authorization_endpoint: z.string(), |
| 7 | + token_endpoint: z.string(), |
| 8 | +}); |
| 9 | + |
| 10 | +export type OAuthMetadata = z.infer<typeof OAuthMetadataSchema>; |
| 11 | + |
| 12 | +export const OAuthTokensSchema = z.object({ |
| 13 | + access_token: z.string(), |
| 14 | + refresh_token: z.string().optional(), |
| 15 | + expires_in: z.number().optional(), |
| 16 | +}); |
| 17 | + |
| 18 | +export type OAuthTokens = z.infer<typeof OAuthTokensSchema>; |
| 19 | + |
| 20 | +export async function discoverOAuthMetadata( |
| 21 | + serverUrl: string, |
| 22 | +): Promise<OAuthMetadata> { |
| 23 | + try { |
| 24 | + const url = new URL("/.well-known/oauth-authorization-server", serverUrl); |
| 25 | + const response = await fetch(url.toString()); |
| 26 | + |
| 27 | + if (response.ok) { |
| 28 | + const metadata = await response.json(); |
| 29 | + const validatedMetadata = OAuthMetadataSchema.parse({ |
| 30 | + authorization_endpoint: metadata.authorization_endpoint, |
| 31 | + token_endpoint: metadata.token_endpoint, |
| 32 | + }); |
| 33 | + return validatedMetadata; |
| 34 | + } |
| 35 | + } catch (error) { |
| 36 | + console.warn("OAuth metadata discovery failed:", error); |
| 37 | + } |
| 38 | + |
| 39 | + // Fall back to default endpoints |
| 40 | + const baseUrl = new URL(serverUrl); |
| 41 | + const defaultMetadata = { |
| 42 | + authorization_endpoint: new URL("/authorize", baseUrl).toString(), |
| 43 | + token_endpoint: new URL("/token", baseUrl).toString(), |
| 44 | + }; |
| 45 | + return OAuthMetadataSchema.parse(defaultMetadata); |
| 46 | +} |
| 47 | + |
| 48 | +export async function startOAuthFlow(serverUrl: string): Promise<string> { |
| 49 | + // Generate PKCE challenge |
| 50 | + const challenge = await pkceChallenge(); |
| 51 | + const codeVerifier = challenge.code_verifier; |
| 52 | + const codeChallenge = challenge.code_challenge; |
| 53 | + |
| 54 | + // Store code verifier for later use |
| 55 | + sessionStorage.setItem(SESSION_KEYS.CODE_VERIFIER, codeVerifier); |
| 56 | + |
| 57 | + // Discover OAuth endpoints |
| 58 | + const metadata = await discoverOAuthMetadata(serverUrl); |
| 59 | + |
| 60 | + // Build authorization URL |
| 61 | + const authUrl = new URL(metadata.authorization_endpoint); |
| 62 | + authUrl.searchParams.set("response_type", "code"); |
| 63 | + authUrl.searchParams.set("code_challenge", codeChallenge); |
| 64 | + authUrl.searchParams.set("code_challenge_method", "S256"); |
| 65 | + authUrl.searchParams.set( |
| 66 | + "redirect_uri", |
| 67 | + window.location.origin + "/oauth/callback", |
| 68 | + ); |
| 69 | + |
| 70 | + return authUrl.toString(); |
| 71 | +} |
| 72 | + |
| 73 | +export async function handleOAuthCallback( |
| 74 | + serverUrl: string, |
| 75 | + code: string, |
| 76 | +): Promise<OAuthTokens> { |
| 77 | + // Get stored code verifier |
| 78 | + const codeVerifier = sessionStorage.getItem(SESSION_KEYS.CODE_VERIFIER); |
| 79 | + if (!codeVerifier) { |
| 80 | + throw new Error("No code verifier found"); |
| 81 | + } |
| 82 | + |
| 83 | + // Discover OAuth endpoints |
| 84 | + const metadata = await discoverOAuthMetadata(serverUrl); |
| 85 | + // Exchange code for tokens |
| 86 | + const response = await fetch(metadata.token_endpoint, { |
| 87 | + method: "POST", |
| 88 | + headers: { |
| 89 | + "Content-Type": "application/json", |
| 90 | + }, |
| 91 | + body: JSON.stringify({ |
| 92 | + grant_type: "authorization_code", |
| 93 | + code, |
| 94 | + code_verifier: codeVerifier, |
| 95 | + redirect_uri: window.location.origin + "/oauth/callback", |
| 96 | + }), |
| 97 | + }); |
| 98 | + |
| 99 | + if (!response.ok) { |
| 100 | + throw new Error("Token exchange failed"); |
| 101 | + } |
| 102 | + |
| 103 | + const tokens = await response.json(); |
| 104 | + return OAuthTokensSchema.parse(tokens); |
| 105 | +} |
| 106 | + |
| 107 | +export async function refreshAccessToken( |
| 108 | + serverUrl: string, |
| 109 | +): Promise<OAuthTokens> { |
| 110 | + const refreshToken = sessionStorage.getItem(SESSION_KEYS.REFRESH_TOKEN); |
| 111 | + if (!refreshToken) { |
| 112 | + throw new Error("No refresh token available"); |
| 113 | + } |
| 114 | + |
| 115 | + const metadata = await discoverOAuthMetadata(serverUrl); |
| 116 | + |
| 117 | + const response = await fetch(metadata.token_endpoint, { |
| 118 | + method: "POST", |
| 119 | + headers: { |
| 120 | + "Content-Type": "application/json", |
| 121 | + }, |
| 122 | + body: JSON.stringify({ |
| 123 | + grant_type: "refresh_token", |
| 124 | + refresh_token: refreshToken, |
| 125 | + }), |
| 126 | + }); |
| 127 | + |
| 128 | + if (!response.ok) { |
| 129 | + throw new Error("Token refresh failed"); |
| 130 | + } |
| 131 | + |
| 132 | + const tokens = await response.json(); |
| 133 | + return OAuthTokensSchema.parse(tokens); |
| 134 | +} |
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