311 lines
10 KiB
TypeScript
311 lines
10 KiB
TypeScript
import { Document } from '@langchain/core/documents'
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import axios, { AxiosRequestConfig } from 'axios'
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import * as https from 'https'
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import { BaseDocumentLoader } from 'langchain/document_loaders/base'
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import { TextSplitter } from 'langchain/text_splitter'
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import { omit } from 'lodash'
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import { getFileFromStorage } from '../../../src'
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import { ICommonObject, IDocument, INode, INodeData, INodeOutputsValue, INodeParams } from '../../../src/Interface'
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import { handleEscapeCharacters } from '../../../src/utils'
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class API_DocumentLoaders implements INode {
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label: string
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name: string
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version: number
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description: string
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type: string
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icon: string
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category: string
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baseClasses: string[]
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inputs?: INodeParams[]
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outputs: INodeOutputsValue[]
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constructor() {
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this.label = 'API Loader'
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this.name = 'apiLoader'
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this.version = 2.1
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this.type = 'Document'
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this.icon = 'api.svg'
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this.category = 'Document Loaders'
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this.description = `Load data from an API`
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this.baseClasses = [this.type]
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this.inputs = [
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{
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label: 'Text Splitter',
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name: 'textSplitter',
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type: 'TextSplitter',
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optional: true
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},
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{
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label: 'Method',
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name: 'method',
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type: 'options',
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options: [
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{
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label: 'GET',
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name: 'GET'
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},
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{
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label: 'POST',
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name: 'POST'
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}
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]
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},
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{
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label: 'URL',
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name: 'url',
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type: 'string'
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},
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{
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label: 'Headers',
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name: 'headers',
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type: 'json',
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additionalParams: true,
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optional: true
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},
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{
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label: 'SSL Certificate',
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description: 'Please upload a SSL certificate file in either .pem or .crt',
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name: 'caFile',
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type: 'file',
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fileType: '.pem, .crt',
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additionalParams: true,
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optional: true
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},
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{
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label: 'Body',
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name: 'body',
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type: 'json',
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description:
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'JSON body for the POST request. If not specified, agent will try to figure out itself from AIPlugin if provided',
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additionalParams: true,
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optional: true
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},
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{
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label: 'Additional Metadata',
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name: 'metadata',
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type: 'json',
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description: 'Additional metadata to be added to the extracted documents',
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optional: true,
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additionalParams: true
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},
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{
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label: 'Omit Metadata Keys',
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name: 'omitMetadataKeys',
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type: 'string',
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rows: 4,
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description:
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'Each document loader comes with a default set of metadata keys that are extracted from the document. You can use this field to omit some of the default metadata keys. The value should be a list of keys, seperated by comma. Use * to omit all metadata keys execept the ones you specify in the Additional Metadata field',
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placeholder: 'key1, key2, key3.nestedKey1',
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optional: true,
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additionalParams: true
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}
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]
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this.outputs = [
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{
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label: 'Document',
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name: 'document',
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description: 'Array of document objects containing metadata and pageContent',
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baseClasses: [...this.baseClasses, 'json']
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},
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{
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label: 'Text',
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name: 'text',
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description: 'Concatenated string from pageContent of documents',
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baseClasses: ['string', 'json']
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}
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]
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}
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async init(nodeData: INodeData, _: string, options: ICommonObject): Promise<any> {
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const headers = nodeData.inputs?.headers as string
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const caFileBase64 = nodeData.inputs?.caFile as string
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const url = nodeData.inputs?.url as string
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const body = nodeData.inputs?.body as string
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const method = nodeData.inputs?.method as string
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const textSplitter = nodeData.inputs?.textSplitter as TextSplitter
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const metadata = nodeData.inputs?.metadata
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const _omitMetadataKeys = nodeData.inputs?.omitMetadataKeys as string
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const output = nodeData.outputs?.output as string
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let omitMetadataKeys: string[] = []
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if (_omitMetadataKeys) {
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omitMetadataKeys = _omitMetadataKeys.split(',').map((key) => key.trim())
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}
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const apiLoaderParam: ApiLoaderParams = {
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url,
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method
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}
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if (headers) {
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const parsedHeaders = typeof headers === 'object' ? headers : JSON.parse(headers)
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apiLoaderParam.headers = parsedHeaders
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}
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if (caFileBase64.startsWith('FILE-STORAGE::')) {
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let file = caFileBase64.replace('FILE-STORAGE::', '')
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file = file.replace('[', '')
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file = file.replace(']', '')
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const orgId = options.orgId
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const chatflowid = options.chatflowid
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const fileData = await getFileFromStorage(file, orgId, chatflowid)
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apiLoaderParam.ca = fileData.toString()
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} else {
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const splitDataURI = caFileBase64.split(',')
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splitDataURI.pop()
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const bf = Buffer.from(splitDataURI.pop() || '', 'base64')
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apiLoaderParam.ca = bf.toString('utf-8')
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}
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if (body) {
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const parsedBody = typeof body === 'object' ? body : JSON.parse(body)
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apiLoaderParam.body = parsedBody
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}
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const loader = new ApiLoader(apiLoaderParam)
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let docs: IDocument[] = []
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if (textSplitter) {
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docs = await loader.load()
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docs = await textSplitter.splitDocuments(docs)
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} else {
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docs = await loader.load()
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}
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if (metadata) {
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const parsedMetadata = typeof metadata === 'object' ? metadata : JSON.parse(metadata)
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docs = docs.map((doc) => ({
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...doc,
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metadata:
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_omitMetadataKeys === '*'
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? {
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...parsedMetadata
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}
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: omit(
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{
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...doc.metadata,
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...parsedMetadata
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},
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omitMetadataKeys
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)
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}))
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} else {
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docs = docs.map((doc) => ({
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...doc,
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metadata:
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_omitMetadataKeys === '*'
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? {}
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: omit(
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{
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...doc.metadata
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},
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omitMetadataKeys
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)
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}))
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}
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if (output === 'document') {
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return docs
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} else {
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let finaltext = ''
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for (const doc of docs) {
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finaltext += `${doc.pageContent}\n`
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}
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return handleEscapeCharacters(finaltext, false)
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}
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}
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}
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interface ApiLoaderParams {
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url: string
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method: string
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headers?: ICommonObject
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body?: ICommonObject
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ca?: string
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}
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class ApiLoader extends BaseDocumentLoader {
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public readonly url: string
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public readonly headers?: ICommonObject
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public readonly body?: ICommonObject
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public readonly method: string
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public readonly ca?: string
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constructor({ url, headers, body, method, ca }: ApiLoaderParams) {
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super()
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this.url = url
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this.headers = headers
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this.body = body
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this.method = method
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this.ca = ca
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}
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public async load(): Promise<IDocument[]> {
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if (this.method === 'POST') {
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return this.executePostRequest(this.url, this.headers, this.body, this.ca)
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} else {
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return this.executeGetRequest(this.url, this.headers, this.ca)
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}
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}
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protected async executeGetRequest(url: string, headers?: ICommonObject, ca?: string): Promise<IDocument[]> {
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try {
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const config: AxiosRequestConfig = {}
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if (headers) {
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config.headers = headers
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}
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if (ca) {
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config.httpsAgent = new https.Agent({
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ca: ca
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})
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}
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const response = await axios.get(url, config)
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const responseJsonString = JSON.stringify(response.data, null, 2)
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const doc = new Document({
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pageContent: responseJsonString,
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metadata: {
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url
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}
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})
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return [doc]
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} catch (error) {
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throw new Error(`Failed to fetch ${url}: ${error}`)
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}
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}
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protected async executePostRequest(url: string, headers?: ICommonObject, body?: ICommonObject, ca?: string): Promise<IDocument[]> {
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try {
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const config: AxiosRequestConfig = {}
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if (headers) {
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config.headers = headers
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}
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if (ca) {
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config.httpsAgent = new https.Agent({
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ca: ca
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})
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}
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const response = await axios.post(url, body ?? {}, config)
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const responseJsonString = JSON.stringify(response.data, null, 2)
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const doc = new Document({
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pageContent: responseJsonString,
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metadata: {
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url
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}
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})
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return [doc]
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} catch (error) {
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throw new Error(`Failed to post ${url}: ${error}`)
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}
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}
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}
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module.exports = {
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nodeClass: API_DocumentLoaders
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}
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