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Copyright (c) Microsoft Corporation.\n// Licensed under the MIT License.\n\nimport type { AccessToken, GetTokenOptions, TokenCredential } from \"@azure/core-auth\";\nimport { AuthenticationError, CredentialUnavailableError } from \"../errors.js\";\nimport { credentialLogger, formatError, formatSuccess, processEnvVars } from \"../util/logging.js\";\n\nimport { ClientCertificateCredential } from \"./clientCertificateCredential.js\";\nimport { ClientSecretCredential } from \"./clientSecretCredential.js\";\nimport type { EnvironmentCredentialOptions } from \"./environmentCredentialOptions.js\";\nimport { UsernamePasswordCredential } from \"./usernamePasswordCredential.js\";\nimport { checkTenantId } from \"../util/tenantIdUtils.js\";\nimport { tracingClient } from \"../util/tracing.js\";\n\n/**\n * Contains the list of all supported environment variable names so that an\n * appropriate error message can be generated when no credentials can be\n * configured.\n *\n * @internal\n */\nexport const AllSupportedEnvironmentVariables = [\n \"AZURE_TENANT_ID\",\n \"AZURE_CLIENT_ID\",\n \"AZURE_CLIENT_SECRET\",\n \"AZURE_CLIENT_CERTIFICATE_PATH\",\n \"AZURE_CLIENT_CERTIFICATE_PASSWORD\",\n \"AZURE_USERNAME\",\n \"AZURE_PASSWORD\",\n \"AZURE_ADDITIONALLY_ALLOWED_TENANTS\",\n \"AZURE_CLIENT_SEND_CERTIFICATE_CHAIN\",\n];\n\nfunction getAdditionallyAllowedTenants(): string[] {\n const additionallyAllowedValues = process.env.AZURE_ADDITIONALLY_ALLOWED_TENANTS ?? \"\";\n return additionallyAllowedValues.split(\";\");\n}\n\nconst credentialName = \"EnvironmentCredential\";\nconst logger = credentialLogger(credentialName);\n\nexport function getSendCertificateChain(): boolean {\n const sendCertificateChain = (\n process.env.AZURE_CLIENT_SEND_CERTIFICATE_CHAIN ?? \"\"\n ).toLowerCase();\n const result = sendCertificateChain === \"true\" || sendCertificateChain === \"1\";\n logger.verbose(\n `AZURE_CLIENT_SEND_CERTIFICATE_CHAIN: ${process.env.AZURE_CLIENT_SEND_CERTIFICATE_CHAIN}; sendCertificateChain: ${result}`,\n );\n return result;\n}\n\n/**\n * Enables authentication to Microsoft Entra ID using a client secret or certificate.\n */\nexport class EnvironmentCredential implements TokenCredential {\n private _credential?:\n | ClientSecretCredential\n | ClientCertificateCredential\n | UsernamePasswordCredential = undefined;\n /**\n * Creates an instance of the EnvironmentCredential class and decides what credential to use depending on the available environment variables.\n *\n * Required environment variables:\n * - `AZURE_TENANT_ID`: The Microsoft Entra tenant (directory) ID.\n * - `AZURE_CLIENT_ID`: The client (application) ID of an App Registration in the tenant.\n *\n * If setting the AZURE_TENANT_ID, then you can also set the additionally allowed tenants\n * - `AZURE_ADDITIONALLY_ALLOWED_TENANTS`: For multi-tenant applications, specifies additional tenants for which the credential may acquire tokens with a single semicolon delimited string. Use * to allow all tenants.\n *\n * Environment variables used for client credential authentication:\n * - `AZURE_CLIENT_SECRET`: A client secret that was generated for the App Registration.\n * - `AZURE_CLIENT_CERTIFICATE_PATH`: The path to a PEM certificate to use during the authentication, instead of the client secret.\n * - `AZURE_CLIENT_CERTIFICATE_PASSWORD`: (optional) password for the certificate file.\n * - `AZURE_CLIENT_SEND_CERTIFICATE_CHAIN`: (optional) indicates that the certificate chain should be set in x5c header to support subject name / issuer based authentication.\n *\n * Username and password authentication is deprecated, since it doesn't support multifactor authentication (MFA). See https://aka.ms/azsdk/identity/mfa for more details. Users can still provide environment variables for this authentication method:\n * - `AZURE_USERNAME`: Username to authenticate with.\n * - `AZURE_PASSWORD`: Password to authenticate with.\n *\n * If the environment variables required to perform the authentication are missing, a {@link CredentialUnavailableError} will be thrown.\n * If the authentication fails, or if there's an unknown error, an {@link AuthenticationError} will be thrown.\n *\n * @param options - Options for configuring the client which makes the authentication request.\n */\n constructor(options?: EnvironmentCredentialOptions) {\n // Keep track of any missing environment variables for error details\n\n const assigned = processEnvVars(AllSupportedEnvironmentVariables).assigned.join(\", \");\n logger.info(`Found the following environment variables: ${assigned}`);\n\n const tenantId = process.env.AZURE_TENANT_ID,\n clientId = process.env.AZURE_CLIENT_ID,\n clientSecret = process.env.AZURE_CLIENT_SECRET;\n\n const additionallyAllowedTenantIds = getAdditionallyAllowedTenants();\n const sendCertificateChain = getSendCertificateChain();\n const newOptions = { ...options, additionallyAllowedTenantIds, sendCertificateChain };\n\n if (tenantId) {\n checkTenantId(logger, tenantId);\n }\n\n if (tenantId && clientId && clientSecret) {\n logger.info(\n `Invoking ClientSecretCredential with tenant ID: ${tenantId}, clientId: ${clientId} and clientSecret: [REDACTED]`,\n );\n this._credential = new ClientSecretCredential(tenantId, clientId, clientSecret, newOptions);\n return;\n }\n\n const certificatePath = process.env.AZURE_CLIENT_CERTIFICATE_PATH;\n const certificatePassword = process.env.AZURE_CLIENT_CERTIFICATE_PASSWORD;\n if (tenantId && clientId && certificatePath) {\n logger.info(\n `Invoking ClientCertificateCredential with tenant ID: ${tenantId}, clientId: ${clientId} and certificatePath: ${certificatePath}`,\n );\n this._credential = new ClientCertificateCredential(\n tenantId,\n clientId,\n { certificatePath, certificatePassword },\n newOptions,\n );\n return;\n }\n\n const username = process.env.AZURE_USERNAME;\n const password = process.env.AZURE_PASSWORD;\n if (tenantId && clientId && username && password) {\n logger.info(\n `Invoking UsernamePasswordCredential with tenant ID: ${tenantId}, clientId: ${clientId} and username: ${username}`,\n );\n\n logger.warning(\n \"Environment is configured to use username and password authentication. This authentication method is deprecated, as it doesn't support multifactor authentication (MFA). Use a more secure credential. For more details, see https://aka.ms/azsdk/identity/mfa.\",\n );\n this._credential = new UsernamePasswordCredential(\n tenantId,\n clientId,\n username,\n password,\n newOptions,\n );\n }\n }\n\n /**\n * Authenticates with Microsoft Entra ID and returns an access token if successful.\n *\n * @param scopes - The list of scopes for which the token will have access.\n * @param options - Optional parameters. See {@link GetTokenOptions}.\n */\n async getToken(scopes: string | string[], options: GetTokenOptions = {}): Promise<AccessToken> {\n return tracingClient.withSpan(`${credentialName}.getToken`, options, async (newOptions) => {\n if (this._credential) {\n try {\n const result = await this._credential.getToken(scopes, newOptions);\n logger.getToken.info(formatSuccess(scopes));\n return result;\n } catch (err: any) {\n const authenticationError = new AuthenticationError(400, {\n error: `${credentialName} authentication failed. To troubleshoot, visit https://aka.ms/azsdk/js/identity/environmentcredential/troubleshoot.`,\n error_description: err.message.toString().split(\"More details:\").join(\"\"),\n });\n logger.getToken.info(formatError(scopes, authenticationError));\n throw authenticationError;\n }\n }\n throw new CredentialUnavailableError(\n `${credentialName} is unavailable. No underlying credential could be used. To troubleshoot, visit https://aka.ms/azsdk/js/identity/environmentcredential/troubleshoot.`,\n );\n });\n }\n}\n"]}
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