| 1 | 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'../../utilities/globals';\n\nimport { visit, DefinitionNode, VariableDefinitionNode } from 'graphql';\n\nimport { ApolloLink } from '../core';\nimport { Observable, hasDirectives } from '../../utilities';\nimport { serializeFetchParameter } from './serializeFetchParameter';\nimport { selectURI } from './selectURI';\nimport {\n handleError,\n readMultipartBody,\n readJsonBody\n} from './parseAndCheckHttpResponse';\nimport { checkFetcher } from './checkFetcher';\nimport {\n selectHttpOptionsAndBodyInternal,\n defaultPrinter,\n fallbackHttpConfig,\n HttpOptions\n} from './selectHttpOptionsAndBody';\nimport { createSignalIfSupported } from './createSignalIfSupported';\nimport { rewriteURIForGET } from './rewriteURIForGET';\nimport { fromError } from '../utils';\nimport { maybe } from '../../utilities';\n\nconst backupFetch = maybe(() => fetch);\n\nexport const createHttpLink = (linkOptions: HttpOptions = {}) => {\n let {\n uri = '/graphql',\n // use default global fetch if nothing passed in\n fetch: preferredFetch,\n print = defaultPrinter,\n includeExtensions,\n preserveHeaderCase,\n useGETForQueries,\n includeUnusedVariables = false,\n ...requestOptions\n } = linkOptions;\n\n if (__DEV__) {\n // Make sure at least one of preferredFetch, window.fetch, or backupFetch is\n // defined, so requests won't fail at runtime.\n checkFetcher(preferredFetch || backupFetch);\n }\n\n const linkConfig = {\n http: { includeExtensions, preserveHeaderCase },\n options: requestOptions.fetchOptions,\n credentials: requestOptions.credentials,\n headers: requestOptions.headers,\n };\n\n return new ApolloLink(operation => {\n let chosenURI = selectURI(operation, uri);\n\n const context = operation.getContext();\n\n // `apollographql-client-*` headers are automatically set if a\n // `clientAwareness` object is found in the context. These headers are\n // set first, followed by the rest of the headers pulled from\n // `context.headers`. If desired, `apollographql-client-*` headers set by\n // the `clientAwareness` object can be overridden by\n // `apollographql-client-*` headers set in `context.headers`.\n const clientAwarenessHeaders: {\n 'apollographql-client-name'?: string;\n 'apollographql-client-version'?: string;\n } = {};\n\n if (context.clientAwareness) {\n const { name, version } = context.clientAwareness;\n if (name) {\n clientAwarenessHeaders['apollographql-client-name'] = name;\n }\n if (version) {\n clientAwarenessHeaders['apollographql-client-version'] = version;\n }\n }\n\n const contextHeaders = { ...clientAwarenessHeaders, ...context.headers };\n\n const contextConfig = {\n http: context.http,\n options: context.fetchOptions,\n credentials: context.credentials,\n headers: contextHeaders,\n };\n\n //uses fallback, link, and then context to build options\n const { options, body } = selectHttpOptionsAndBodyInternal(\n operation,\n print,\n fallbackHttpConfig,\n linkConfig,\n contextConfig,\n );\n\n if (body.variables && !includeUnusedVariables) {\n const unusedNames = new Set(Object.keys(body.variables));\n visit(operation.query, {\n Variable(node, _key, parent) {\n // A variable type definition at the top level of a query is not\n // enough to silence server-side errors about the variable being\n // unused, so variable definitions do not count as usage.\n // https://spec.graphql.org/draft/#sec-All-Variables-Used\n if (parent && (parent as VariableDefinitionNode).kind !== 'VariableDefinition') {\n unusedNames.delete(node.name.value);\n }\n },\n });\n if (unusedNames.size) {\n // Make a shallow copy of body.variables (with keys in the same\n // order) and then delete unused variables from the copy.\n body.variables = { ...body.variables };\n unusedNames.forEach(name => {\n delete body.variables![name];\n });\n }\n }\n\n let controller: any;\n if (!(options as any).signal) {\n const { controller: _controller, signal } = createSignalIfSupported();\n controller = _controller;\n if (controller) (options as any).signal = signal;\n }\n\n // If requested, set method to GET if there are no mutations.\n const definitionIsMutation = (d: DefinitionNode) => {\n return d.kind === 'OperationDefinition' && d.operation === 'mutation';\n };\n if (\n useGETForQueries &&\n !operation.query.definitions.some(definitionIsMutation)\n ) {\n options.method = 'GET';\n }\n\n // does not match custom directives beginning with @defer\n if (hasDirectives(['defer'], operation.query)) {\n options.headers = options.headers || {};\n options.headers.accept = \"multipart/mixed; deferSpec=20220824, application/json\";\n }\n\n if (options.method === 'GET') {\n const { newURI, parseError } = rewriteURIForGET(chosenURI, body);\n if (parseError) {\n return fromError(parseError);\n }\n chosenURI = newURI;\n } else {\n try {\n (options as any).body = serializeFetchParameter(body, 'Payload');\n } catch (parseError) {\n return fromError(parseError);\n }\n }\n\n return new Observable(observer => {\n // Prefer linkOptions.fetch (preferredFetch) if provided, and otherwise\n // fall back to the *current* global window.fetch function (see issue\n // #7832), or (if all else fails) the backupFetch function we saved when\n // this module was first evaluated. This last option protects against the\n // removal of window.fetch, which is unlikely but not impossible.\n const currentFetch = preferredFetch || maybe(() => fetch) || backupFetch;\n\n currentFetch!(chosenURI, options)\n .then(response => {\n operation.setContext({ response });\n const ctype = response.headers?.get('content-type');\n\n if (ctype !== null && /^multipart\\/mixed/i.test(ctype)) {\n return readMultipartBody(response, observer);\n } else {\n return readJsonBody(response, operation, observer);\n }\n })\n .catch(err => handleError(err, observer));\n\n return () => {\n // XXX support canceling this request\n // https://developers.google.com/web/updates/2017/09/abortable-fetch\n if (controller) controller.abort();\n };\n });\n });\n};\n"]} |