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First draft of parser service

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GeorgeWebberley 2026-03-01 12:27:08 +01:00
parent 36f34257d2
commit 42eaac6a39
3 changed files with 842 additions and 2 deletions
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"url": "https://github.com/fb55/domutils?sponsor=1"
}
},
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"version": "16.6.1",
"resolved": "https://registry.npmjs.org/dotenv/-/dotenv-16.6.1.tgz",
@ -7719,6 +8137,31 @@
"node": ">= 0.8"
}
},
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"resolved": "https://registry.npmjs.org/encoding-sniffer/-/encoding-sniffer-0.2.1.tgz",
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"dependencies": {
"iconv-lite": "^0.6.3",
"whatwg-encoding": "^3.1.1"
},
"funding": {
"url": "https://github.com/fb55/encoding-sniffer?sponsor=1"
}
},
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"version": "0.6.3",
"resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
"integrity": "sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==",
"license": "MIT",
"dependencies": {
"safer-buffer": ">= 2.1.2 < 3.0.0"
},
"engines": {
"node": ">=0.10.0"
}
},
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"version": "5.20.0",
"resolved": "https://registry.npmjs.org/enhanced-resolve/-/enhanced-resolve-5.20.0.tgz",
@ -7733,6 +8176,18 @@
"node": ">=10.13.0"
}
},
"node_modules/entities": {
"version": "4.5.0",
"resolved": "https://registry.npmjs.org/entities/-/entities-4.5.0.tgz",
"integrity": "sha512-V0hjH4dGPh9Ao5p0MoRY6BVqtwCjhz6vI5LT8AJ55H+4g9/4vbHx1I54fS0XuclLhDHArPQCiMjDxjaL8fPxhw==",
"license": "BSD-2-Clause",
"engines": {
"node": ">=0.12"
},
"funding": {
"url": "https://github.com/fb55/entities?sponsor=1"
}
},
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"version": "1.3.4",
"resolved": "https://registry.npmjs.org/error-ex/-/error-ex-1.3.4.tgz",
@ -9068,6 +9523,37 @@
"dev": true,
"license": "MIT"
},
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"version": "10.1.0",
"resolved": "https://registry.npmjs.org/htmlparser2/-/htmlparser2-10.1.0.tgz",
"integrity": "sha512-VTZkM9GWRAtEpveh7MSF6SjjrpNVNNVJfFup7xTY3UpFtm67foy9HDVXneLtFVt4pMz5kZtgNcvCniNFb1hlEQ==",
"funding": [
"https://github.com/fb55/htmlparser2?sponsor=1",
{
"type": "github",
"url": "https://github.com/sponsors/fb55"
}
],
"license": "MIT",
"dependencies": {
"domelementtype": "^2.3.0",
"domhandler": "^5.0.3",
"domutils": "^3.2.2",
"entities": "^7.0.1"
}
},
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"version": "7.0.1",
"resolved": "https://registry.npmjs.org/entities/-/entities-7.0.1.tgz",
"integrity": "sha512-TWrgLOFUQTH994YUyl1yT4uyavY5nNB5muff+RtWaqNVCAK408b5ZnnbNAUEWLTCpum9w6arT70i1XdQ4UeOPA==",
"license": "BSD-2-Clause",
"engines": {
"node": ">=0.12"
},
"funding": {
"url": "https://github.com/fb55/entities?sponsor=1"
}
},
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"version": "2.0.1",
"resolved": "https://registry.npmjs.org/http-errors/-/http-errors-2.0.1.tgz",
@ -10228,6 +10714,15 @@
"jiti": "lib/jiti-cli.mjs"
}
},
"node_modules/js-tiktoken": {
"version": "1.0.21",
"resolved": "https://registry.npmjs.org/js-tiktoken/-/js-tiktoken-1.0.21.tgz",
"integrity": "sha512-biOj/6M5qdgx5TKjDnFT1ymSpM5tbd3ylwDtrQvFQSu0Z7bBYko2dF+W/aUkXUPuk6IVpRxk/3Q2sHOzGlS36g==",
"license": "MIT",
"dependencies": {
"base64-js": "^1.5.1"
}
},
"node_modules/js-tokens": {
"version": "4.0.0",
"resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-4.0.0.tgz",
@ -10332,6 +10827,65 @@
"json-buffer": "3.0.1"
}
},
"node_modules/langsmith": {
"version": "0.5.7",
"resolved": "https://registry.npmjs.org/langsmith/-/langsmith-0.5.7.tgz",
"integrity": "sha512-FjYf2oBGMoSXnaT4SRaFguIiGJaonZ5VKWKJDPl9awLZjz2RkN29AcQWceecSINVzXzTvtRWPOjAWT+XggqNNg==",
"license": "MIT",
"dependencies": {
"@types/uuid": "^10.0.0",
"chalk": "^5.6.2",
"console-table-printer": "^2.12.1",
"p-queue": "^6.6.2",
"semver": "^7.6.3",
"uuid": "^10.0.0"
},
"peerDependencies": {
"@opentelemetry/api": "*",
"@opentelemetry/exporter-trace-otlp-proto": "*",
"@opentelemetry/sdk-trace-base": "*",
"openai": "*"
},
"peerDependenciesMeta": {
"@opentelemetry/api": {
"optional": true
},
"@opentelemetry/exporter-trace-otlp-proto": {
"optional": true
},
"@opentelemetry/sdk-trace-base": {
"optional": true
},
"openai": {
"optional": true
}
}
},
"node_modules/langsmith/node_modules/chalk": {
"version": "5.6.2",
"resolved": "https://registry.npmjs.org/chalk/-/chalk-5.6.2.tgz",
"integrity": "sha512-7NzBL0rN6fMUW+f7A6Io4h40qQlG+xGmtMxfbnH/K7TAtt8JQWVQK+6g0UXKMeVJoyV5EkkNsErQ8pVD3bLHbA==",
"license": "MIT",
"engines": {
"node": "^12.17.0 || ^14.13 || >=16.0.0"
},
"funding": {
"url": "https://github.com/chalk/chalk?sponsor=1"
}
},
"node_modules/langsmith/node_modules/uuid": {
"version": "10.0.0",
"resolved": "https://registry.npmjs.org/uuid/-/uuid-10.0.0.tgz",
"integrity": "sha512-8XkAphELsDnEGrDxUOHB3RGvXz6TeuYSGEZBOjtTtPm2lwhGBjLgOzLHB63IUWfBpNucQjND6d3AOudO+H3RWQ==",
"funding": [
"https://github.com/sponsors/broofa",
"https://github.com/sponsors/ctavan"
],
"license": "MIT",
"bin": {
"uuid": "dist/bin/uuid"
}
},
"node_modules/leven": {
"version": "3.1.0",
"resolved": "https://registry.npmjs.org/leven/-/leven-3.1.0.tgz",
@ -10759,6 +11313,15 @@
"integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
"license": "MIT"
},
"node_modules/mustache": {
"version": "4.2.0",
"resolved": "https://registry.npmjs.org/mustache/-/mustache-4.2.0.tgz",
"integrity": "sha512-71ippSywq5Yb7/tVYyGbkBggbU8H3u5Rz56fH60jGFgr8uHwxs+aSKeqmluIVzM0m0kB7xQjKS6qPfd0b2ZoqQ==",
"license": "MIT",
"bin": {
"mustache": "bin/mustache"
}
},
"node_modules/mute-stream": {
"version": "2.0.0",
"resolved": "https://registry.npmjs.org/mute-stream/-/mute-stream-2.0.0.tgz",
@ -10902,6 +11465,18 @@
"node": ">=8"
}
},
"node_modules/nth-check": {
"version": "2.1.1",
"resolved": "https://registry.npmjs.org/nth-check/-/nth-check-2.1.1.tgz",
"integrity": "sha512-lqjrjmaOoAnWfMmBPL+XNnynZh2+swxiX3WUE0s4yEHI6m+AwrK2UZOimIRl3X/4QctVqS8AiZjFqyOGrMXb/w==",
"license": "BSD-2-Clause",
"dependencies": {
"boolbase": "^1.0.0"
},
"funding": {
"url": "https://github.com/fb55/nth-check?sponsor=1"
}
},
"node_modules/nypm": {
"version": "0.6.5",
"resolved": "https://registry.npmjs.org/nypm/-/nypm-0.6.5.tgz",
@ -11043,6 +11618,15 @@
"url": "https://github.com/sponsors/sindresorhus"
}
},
"node_modules/p-finally": {
"version": "1.0.0",
"resolved": "https://registry.npmjs.org/p-finally/-/p-finally-1.0.0.tgz",
"integrity": "sha512-LICb2p9CB7FS+0eR1oqWnHhp0FljGLZCWBE9aix0Uye9W8LTQPwMTYVGWQWIw9RdQiDg4+epXQODwIYJtSJaow==",
"license": "MIT",
"engines": {
"node": ">=4"
}
},
"node_modules/p-limit": {
"version": "3.1.0",
"resolved": "https://registry.npmjs.org/p-limit/-/p-limit-3.1.0.tgz",
@ -11075,6 +11659,40 @@
"url": "https://github.com/sponsors/sindresorhus"
}
},
"node_modules/p-queue": {
"version": "6.6.2",
"resolved": "https://registry.npmjs.org/p-queue/-/p-queue-6.6.2.tgz",
"integrity": "sha512-RwFpb72c/BhQLEXIZ5K2e+AhgNVmIejGlTgiB9MzZ0e93GRvqZ7uSi0dvRF7/XIXDeNkra2fNHBxTyPDGySpjQ==",
"license": "MIT",
"dependencies": {
"eventemitter3": "^4.0.4",
"p-timeout": "^3.2.0"
},
"engines": {
"node": ">=8"
},
"funding": {
"url": "https://github.com/sponsors/sindresorhus"
}
},
"node_modules/p-queue/node_modules/eventemitter3": {
"version": "4.0.7",
"resolved": "https://registry.npmjs.org/eventemitter3/-/eventemitter3-4.0.7.tgz",
"integrity": "sha512-8guHBZCwKnFhYdHr2ysuRWErTwhoN2X8XELRlrRwpmfeY2jjuUN4taQMsULKUVo1K4DvZl+0pgfyoysHxvmvEw==",
"license": "MIT"
},
"node_modules/p-timeout": {
"version": "3.2.0",
"resolved": "https://registry.npmjs.org/p-timeout/-/p-timeout-3.2.0.tgz",
"integrity": "sha512-rhIwUycgwwKcP9yTOOFK/AKsAopjjCakVqLHePO3CC6Mir1Z99xT+R63jZxAT5lFZLa2inS5h+ZS2GvR99/FBg==",
"license": "MIT",
"dependencies": {
"p-finally": "^1.0.0"
},
"engines": {
"node": ">=8"
}
},
"node_modules/p-try": {
"version": "2.2.0",
"resolved": "https://registry.npmjs.org/p-try/-/p-try-2.2.0.tgz",
@ -11124,6 +11742,55 @@
"url": "https://github.com/sponsors/sindresorhus"
}
},
"node_modules/parse5": {
"version": "7.3.0",
"resolved": "https://registry.npmjs.org/parse5/-/parse5-7.3.0.tgz",
"integrity": "sha512-IInvU7fabl34qmi9gY8XOVxhYyMyuH2xUNpb2q8/Y+7552KlejkRvqvD19nMoUW/uQGGbqNpA6Tufu5FL5BZgw==",
"license": "MIT",
"dependencies": {
"entities": "^6.0.0"
},
"funding": {
"url": "https://github.com/inikulin/parse5?sponsor=1"
}
},
"node_modules/parse5-htmlparser2-tree-adapter": {
"version": "7.1.0",
"resolved": "https://registry.npmjs.org/parse5-htmlparser2-tree-adapter/-/parse5-htmlparser2-tree-adapter-7.1.0.tgz",
"integrity": "sha512-ruw5xyKs6lrpo9x9rCZqZZnIUntICjQAd0Wsmp396Ul9lN/h+ifgVV1x1gZHi8euej6wTfpqX8j+BFQxF0NS/g==",
"license": "MIT",
"dependencies": {
"domhandler": "^5.0.3",
"parse5": "^7.0.0"
},
"funding": {
"url": "https://github.com/inikulin/parse5?sponsor=1"
}
},
"node_modules/parse5-parser-stream": {
"version": "7.1.2",
"resolved": "https://registry.npmjs.org/parse5-parser-stream/-/parse5-parser-stream-7.1.2.tgz",
"integrity": "sha512-JyeQc9iwFLn5TbvvqACIF/VXG6abODeB3Fwmv/TGdLk2LfbWkaySGY72at4+Ty7EkPZj854u4CrICqNk2qIbow==",
"license": "MIT",
"dependencies": {
"parse5": "^7.0.0"
},
"funding": {
"url": "https://github.com/inikulin/parse5?sponsor=1"
}
},
"node_modules/parse5/node_modules/entities": {
"version": "6.0.1",
"resolved": "https://registry.npmjs.org/entities/-/entities-6.0.1.tgz",
"integrity": "sha512-aN97NXWF6AWBTahfVOIrB/NShkzi5H7F9r1s9mD3cDj4Ko5f2qhhVoYMibXF7GlLveb/D2ioWay8lxI97Ven3g==",
"license": "BSD-2-Clause",
"engines": {
"node": ">=0.12"
},
"funding": {
"url": "https://github.com/fb55/entities?sponsor=1"
}
},
"node_modules/parseurl": {
"version": "1.3.3",
"resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.3.tgz",
@ -11217,6 +11884,38 @@
"devOptional": true,
"license": "MIT"
},
"node_modules/pdf-parse": {
"version": "2.4.5",
"resolved": "https://registry.npmjs.org/pdf-parse/-/pdf-parse-2.4.5.tgz",
"integrity": "sha512-mHU89HGh7v+4u2ubfnevJ03lmPgQ5WU4CxAVmTSh/sxVTEDYd1er/dKS/A6vg77NX47KTEoihq8jZBLr8Cxuwg==",
"license": "Apache-2.0",
"dependencies": {
"@napi-rs/canvas": "0.1.80",
"pdfjs-dist": "5.4.296"
},
"bin": {
"pdf-parse": "bin/cli.mjs"
},
"engines": {
"node": ">=20.16.0 <21 || >=22.3.0"
},
"funding": {
"type": "github",
"url": "https://github.com/sponsors/mehmet-kozan"
}
},
"node_modules/pdfjs-dist": {
"version": "5.4.296",
"resolved": "https://registry.npmjs.org/pdfjs-dist/-/pdfjs-dist-5.4.296.tgz",
"integrity": "sha512-DlOzet0HO7OEnmUmB6wWGJrrdvbyJKftI1bhMitK7O2N8W2gc757yyYBbINy9IDafXAV9wmKr9t7xsTaNKRG5Q==",
"license": "Apache-2.0",
"engines": {
"node": ">=20.16.0 || >=22.3.0"
},
"optionalDependencies": {
"@napi-rs/canvas": "^0.1.80"
}
},
"node_modules/perfect-debounce": {
"version": "1.0.0",
"resolved": "https://registry.npmjs.org/perfect-debounce/-/perfect-debounce-1.0.0.tgz",
@ -12013,7 +12712,6 @@
"version": "7.7.4",
"resolved": "https://registry.npmjs.org/semver/-/semver-7.7.4.tgz",
"integrity": "sha512-vFKC2IEtQnVhpT78h1Yp8wzwrf8CM+MzKMHGJZfBtzhZNycRFnXsHk6E5TxIkkMsgNS7mdX3AGB7x2QM2di4lA==",
"dev": true,
"license": "ISC",
"bin": {
"semver": "bin/semver.js"
@ -12234,6 +12932,12 @@
"url": "https://github.com/sponsors/isaacs"
}
},
"node_modules/simple-wcswidth": {
"version": "1.1.2",
"resolved": "https://registry.npmjs.org/simple-wcswidth/-/simple-wcswidth-1.1.2.tgz",
"integrity": "sha512-j7piyCjAeTDSjzTSQ7DokZtMNwNlEAyxqSZeCS+CXH7fJ4jx3FuJ/mTW3mE+6JLs4VJBbcll0Kjn+KXI5t21Iw==",
"license": "MIT"
},
"node_modules/slash": {
"version": "3.0.0",
"resolved": "https://registry.npmjs.org/slash/-/slash-3.0.0.tgz",
@ -13244,6 +13948,15 @@
"url": "https://github.com/sponsors/sindresorhus"
}
},
"node_modules/undici": {
"version": "7.22.0",
"resolved": "https://registry.npmjs.org/undici/-/undici-7.22.0.tgz",
"integrity": "sha512-RqslV2Us5BrllB+JeiZnK4peryVTndy9Dnqq62S3yYRRTj0tFQCwEniUy2167skdGOy3vqRzEvl1Dm4sV2ReDg==",
"license": "MIT",
"engines": {
"node": ">=20.18.1"
}
},
"node_modules/undici-types": {
"version": "6.21.0",
"resolved": "https://registry.npmjs.org/undici-types/-/undici-types-6.21.0.tgz",
@ -13619,6 +14332,31 @@
"url": "https://opencollective.com/webpack"
}
},
"node_modules/whatwg-encoding": {
"version": "3.1.1",
"resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-3.1.1.tgz",
"integrity": "sha512-6qN4hJdMwfYBtE3YBTTHhoeuUrDBPZmbQaxWAqSALV/MeEnR5z1xd8UKud2RAkFoPkmB+hli1TZSnyi84xz1vQ==",
"deprecated": "Use @exodus/bytes instead for a more spec-conformant and faster implementation",
"license": "MIT",
"dependencies": {
"iconv-lite": "0.6.3"
},
"engines": {
"node": ">=18"
}
},
"node_modules/whatwg-encoding/node_modules/iconv-lite": {
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"resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
"integrity": "sha512-4fCk79wshMdzMp2rH06qWrJE4iolqLhCUH+OiuIgU++RB0+94NlDL81atO7GX55uUKueo0txHNtvEyI6D7WdMw==",
"license": "MIT",
"dependencies": {
"safer-buffer": ">= 2.1.2 < 3.0.0"
},
"engines": {
"node": ">=0.10.0"
}
},
"node_modules/whatwg-mimetype": {
"version": "4.0.0",
"resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-4.0.0.tgz",

4
package.json
View file

@ -25,6 +25,8 @@
"@as-integrations/express5": "^1.1.2",
"@aws-sdk/client-s3": "^3.1000.0",
"@aws-sdk/s3-request-presigner": "^3.1000.0",
"@langchain/core": "^1.1.29",
"@langchain/google-genai": "^2.1.22",
"@nestjs/apollo": "^13.2.4",
"@nestjs/common": "^11.1.14",
"@nestjs/config": "^4.0.3",
@ -33,11 +35,13 @@
"@nestjs/platform-express": "^11.0.1",
"@prisma/adapter-pg": "^7.4.2",
"@prisma/client": "^7.4.2",
"cheerio": "^1.2.0",
"class-transformer": "^0.5.1",
"class-validator": "^0.15.1",
"graphql": "^16.13.0",
"graphql-type-json": "^0.3.2",
"graphql-upload-ts": "^2.1.3",
"pdf-parse": "^2.4.5",
"pg": "^8.19.0",
"reflect-metadata": "^0.2.2",
"rxjs": "^7.8.2",

98
src/cases/parser/parser.service.ts Normal file
View file

@ -0,0 +1,98 @@
import { Injectable, BadRequestException } from '@nestjs/common';
import * as cheerio from 'cheerio';
import { z } from 'zod';
import { ChatGoogleGenerativeAI } from '@langchain/google-genai';
import { PDFParse } from 'pdf-parse';
const CaseMetadataSchema = z.object({
title: z.string().describe("The official title or heading of the case."),
decisionType: z.string().describe("The formal category of the ruling (e.g., Judgment, Final Decision, Stay of Execution, or Administrative Order etc.)."),
decisionDate: z.string().describe("The date the decision was rendered"),
office: z.string().describe("The specific department, chamber, or administrative division within the court system."),
court: z.string().describe("The court's full official name of the adjudicating body. Do not use relative references; instead, identify the institution from the document header, the formal seal, or the specific treaty/statute that establishes its jurisdiction."),
caseNumber: z.string().describe(
"The formal administrative or legal identifier assigned to the matter."
),
summary: z.string().describe(
"A concise brief of the dispute and the final determination."
),
});
export interface ExtractedData extends z.infer<typeof CaseMetadataSchema> {
metadata?: any;
decisionDateAsDate?: Date;
}
@Injectable()
export class ParserService {
static async parse(buffer: Buffer, mimetype: string, job?: any): Promise<ExtractedData> {
const parser = new ParserService();
return parser.process(buffer, mimetype, job);
}
async process(buffer: Buffer, mimetype: string, job?: any): Promise<ExtractedData> {
let text = '';
if (mimetype === 'application/pdf') {
const parser = new PDFParse({ data: buffer as any });
const textResult = await parser.getText();
text = textResult.text;
await parser.destroy();
} else if (mimetype === 'text/html') {
const $ = cheerio.load(buffer.toString());
// Strip elements that add noise — scripts, styles, navigation etc.
$('script, style, nav, footer, header, noscript, iframe').remove();
text = $('body').text().replace(/\s+/g, ' ').trim() || buffer.toString();
} else {
throw new BadRequestException(`Unsupported file type: ${mimetype}`);
}
if (job) await job.updateProgress('🤖 Analyzing case structure with Gemini AI...');
return this.extractWithAI(text);
}
private async extractWithAI(text: string): Promise<ExtractedData> {
const apiKey = process.env.GOOGLE_API_KEY;
if (!apiKey) {
throw new Error('GOOGLE_API_KEY not configured.');
}
const model = new ChatGoogleGenerativeAI({
apiKey,
model: 'gemini-2.5-flash',
temperature: 0,
});
const structuredLlm = model.withStructuredOutput(CaseMetadataSchema);
// I read that the most important part of the document for metadata extraction is the
// start/end of the document. But I am not a lawyer and uncertain so decided not to
// risk it. In the end I just set a hard cap at 500k characters to avoid abuse.
const maxChars = 500_000;
const documentText = text.length > maxChars ? text.substring(0, maxChars) : text;
try {
const result = await structuredLlm.invoke(`
You are a specialized legal document processing assistant.
Extract the case metadata from the following court decision text.
All fields should be extracted without exception.
TEXT TO ANALYZE:
${documentText}
`);
return {
...result,
decisionDateAsDate: result.decisionDate ? new Date(result.decisionDate) : undefined,
metadata: {
rawLength: text.length,
model: 'gemini-2.5-flash',
extractedAt: new Date().toISOString(),
},
};
} catch (error) {
throw new Error(`AI Extraction failed: ${error.message}`);
}
}
}