463 lines
18 KiB
TypeScript
463 lines
18 KiB
TypeScript
import { defineBackground } from 'wxt/utils/define-background';
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import nacl from 'tweetnacl';
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// ─── Fetch with timeout ───────────────────────────────────────────────────────
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async function fetchWithTimeout(url: string, options: RequestInit, timeoutMs = 30000): Promise<Response> {
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const controller = new AbortController();
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const id = setTimeout(() => controller.abort(), timeoutMs);
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try {
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return await fetch(url, { ...options, signal: controller.signal });
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} finally {
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clearTimeout(id);
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}
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}
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// ─── Types ────────────────────────────────────────────────────────────────────
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interface AnalyzePayload {
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text: string;
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action: string;
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}
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interface LexAIConfig {
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provider?: string;
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apiKey?: string;
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apiKeyEnc?: string;
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encKey?: string;
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model?: string;
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}
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interface LexAIResponse {
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result?: string;
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error?: string;
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}
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// ─── System prompts ───────────────────────────────────────────────────────────
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function getSystemPrompt(action: string): string {
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const prompts: Record<string, string> = {
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grammar:
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'You are a professional grammar editor. Fix all grammar, spelling, and punctuation errors in the provided text. ' +
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'Preserve the original meaning and tone as closely as possible. ' +
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'Return ONLY the corrected text — no explanations, no preamble.',
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rephrase:
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'You are a skilled writing assistant. Rephrase the provided text to make it clearer, more engaging, and more professional. ' +
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'Keep the same meaning and approximate length. ' +
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'Return ONLY the rephrased text — no explanations.',
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shorten:
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'You are a concise editor. Shorten the provided text by at least 30% while preserving the core message. ' +
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'Remove filler words, redundant phrases, and unnecessary detail. ' +
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'Return ONLY the shortened text.',
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expand:
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'You are an experienced writer. Expand the provided text with more detail, context, and supporting points. ' +
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'Make it richer and more informative while staying on topic. ' +
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'Return ONLY the expanded text.',
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tone:
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'You are a writing coach. Analyze the tone of the provided text. ' +
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'Describe the tone characteristics (e.g. formal, casual, aggressive, passive, confident, etc.) ' +
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'and note any issues like passive voice, wordiness, or emotional bias. ' +
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'Return a brief, clear analysis — no rewriting, no extra commentary.',
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};
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return prompts[action] ?? prompts.grammar;
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}
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// ─── Encryption helpers ───────────────────────────────────────────────────────
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async function decryptApiKey(encKeyB64: string, apiKeyEncB64: string): Promise<string | null> {
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const key = Uint8Array.from(atob(encKeyB64), c => c.charCodeAt(0));
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const combined = Uint8Array.from(atob(apiKeyEncB64), c => c.charCodeAt(0));
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const nonce = combined.slice(0, 24);
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const cipher = combined.slice(24);
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const decrypted = nacl.secretbox.open(cipher, nonce, key);
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if (!decrypted) return null;
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return new TextDecoder().decode(decrypted);
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}
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// ─── Provider implementations ─────────────────────────────────────────────────
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async function callOpenAI(payload: AnalyzePayload, config: LexAIConfig): Promise<LexAIResponse> {
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const model = config.model || 'gpt-4o-mini';
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let res: Response;
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try {
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res = await fetchWithTimeout('https://api.openai.com/v1/chat/completions', {
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method: 'POST',
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headers: {
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'Content-Type': 'application/json',
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Authorization: `Bearer ${config.apiKey}`,
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},
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body: JSON.stringify({
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model,
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messages: [
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{ role: 'system', content: getSystemPrompt(payload.action) },
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{ role: 'user', content: payload.text },
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],
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max_tokens: 1024,
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temperature: 0.7,
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}),
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});
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} catch (err) {
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return { error: `Network error reaching OpenAI: ${String(err)}` };
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}
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const data = await res.json();
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if (!res.ok) {
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const msg = data?.error?.message ?? `HTTP ${res.status}`;
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return { error: `OpenAI error: ${msg}` };
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}
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const result = data?.choices?.[0]?.message?.content as string | undefined;
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if (!result) return { error: 'OpenAI returned an empty response.' };
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return { result: result.trim() };
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}
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async function callAnthropic(payload: AnalyzePayload, config: LexAIConfig): Promise<LexAIResponse> {
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const model = config.model || 'claude-3-5-haiku-20241022';
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let res: Response;
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try {
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res = await fetchWithTimeout('https://api.anthropic.com/v1/messages', {
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method: 'POST',
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headers: {
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'Content-Type': 'application/json',
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'x-api-key': config.apiKey!,
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'anthropic-version': '2023-06-01',
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},
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body: JSON.stringify({
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model,
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max_tokens: 1024,
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system: getSystemPrompt(payload.action),
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messages: [{ role: 'user', content: payload.text }],
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}),
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});
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} catch (err) {
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return { error: `Network error reaching Anthropic: ${String(err)}` };
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}
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const data = await res.json();
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if (!res.ok) {
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const msg = data?.error?.message ?? `HTTP ${res.status}`;
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return { error: `Anthropic error: ${msg}` };
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}
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const result = data?.content?.[0]?.text as string | undefined;
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if (!result) return { error: 'Anthropic returned an empty response.' };
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return { result: result.trim() };
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}
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async function callGroq(payload: AnalyzePayload, config: LexAIConfig): Promise<LexAIResponse> {
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const model = config.model || 'llama-3.3-70b-versatile';
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let res: Response;
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try {
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res = await fetchWithTimeout('https://api.groq.com/openai/v1/chat/completions', {
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method: 'POST',
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headers: {
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'Content-Type': 'application/json',
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Authorization: `Bearer ${config.apiKey}`,
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},
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body: JSON.stringify({
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model,
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messages: [
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{ role: 'system', content: getSystemPrompt(payload.action) },
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{ role: 'user', content: payload.text },
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],
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max_tokens: 1024,
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temperature: 0.7,
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}),
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});
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} catch (err) {
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return { error: `Network error reaching Groq: ${String(err)}` };
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}
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const data = await res.json();
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if (!res.ok) {
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const msg = data?.error?.message ?? `HTTP ${res.status}`;
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return { error: `Groq error: ${msg}` };
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}
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const result = data?.choices?.[0]?.message?.content as string | undefined;
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if (!result) return { error: 'Groq returned an empty response.' };
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return { result: result.trim() };
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}
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async function callOpenRouter(payload: AnalyzePayload, config: LexAIConfig): Promise<LexAIResponse> {
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const model = config.model || 'openai/gpt-4o-mini';
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let res: Response;
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try {
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res = await fetchWithTimeout('https://openrouter.ai/api/v1/chat/completions', {
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method: 'POST',
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headers: {
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'Content-Type': 'application/json',
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Authorization: `Bearer ${config.apiKey}`,
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'HTTP-Referer': 'https://lexai.dev',
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'X-Title': 'LexAI',
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},
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body: JSON.stringify({
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model,
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messages: [
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{ role: 'system', content: getSystemPrompt(payload.action) },
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{ role: 'user', content: payload.text },
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],
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max_tokens: 1024,
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}),
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});
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} catch (err) {
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return { error: `Network error reaching OpenRouter: ${String(err)}` };
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}
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const data = await res.json();
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if (!res.ok) {
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const msg = data?.error?.message ?? `HTTP ${res.status}`;
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return { error: `OpenRouter error: ${msg}` };
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}
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const result = data?.choices?.[0]?.message?.content as string | undefined;
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if (!result) return { error: 'OpenRouter returned an empty response.' };
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return { result: result.trim() };
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}
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// ─── Generic provider call (used by copy-as and future features) ──────────────
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async function callProvider(config: LexAIConfig, text: string, systemPrompt: string): Promise<LexAIResponse> {
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const payload: AnalyzePayload = { text, action: '__custom__' };
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const provider = config.provider || 'openai';
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switch (provider) {
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case 'openai': return callOpenAIWithPrompt(payload, config, systemPrompt);
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case 'anthropic': return callAnthropicWithPrompt(payload, config, systemPrompt);
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case 'groq': return callGroqWithPrompt(payload, config, systemPrompt);
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case 'openrouter': return callOpenRouterWithPrompt(payload, config, systemPrompt);
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default: return { error: `Unknown provider: "${provider}". Please check LexAI settings.` };
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}
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}
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async function callOpenAIWithPrompt(payload: AnalyzePayload, config: LexAIConfig, systemPrompt: string): Promise<LexAIResponse> {
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const model = config.model || 'gpt-4o-mini';
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let res: Response;
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try {
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res = await fetchWithTimeout('https://api.openai.com/v1/chat/completions', {
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method: 'POST',
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headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${config.apiKey}` },
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body: JSON.stringify({
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model,
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messages: [
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{ role: 'system', content: systemPrompt },
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{ role: 'user', content: payload.text },
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],
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max_tokens: 1024,
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temperature: 0.7,
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}),
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});
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} catch (err) {
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return { error: `Network error reaching OpenAI: ${String(err)}` };
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}
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const data = await res.json();
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if (!res.ok) return { error: `OpenAI error: ${data?.error?.message ?? `HTTP ${res.status}`}` };
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const result = data?.choices?.[0]?.message?.content as string | undefined;
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if (!result) return { error: 'OpenAI returned an empty response.' };
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return { result: result.trim() };
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}
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async function callAnthropicWithPrompt(payload: AnalyzePayload, config: LexAIConfig, systemPrompt: string): Promise<LexAIResponse> {
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const model = config.model || 'claude-3-5-haiku-20241022';
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let res: Response;
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try {
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res = await fetchWithTimeout('https://api.anthropic.com/v1/messages', {
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method: 'POST',
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headers: { 'Content-Type': 'application/json', 'x-api-key': config.apiKey!, 'anthropic-version': '2023-06-01' },
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body: JSON.stringify({
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model,
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max_tokens: 1024,
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system: systemPrompt,
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messages: [{ role: 'user', content: payload.text }],
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}),
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});
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} catch (err) {
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return { error: `Network error reaching Anthropic: ${String(err)}` };
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}
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const data = await res.json();
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if (!res.ok) return { error: `Anthropic error: ${data?.error?.message ?? `HTTP ${res.status}`}` };
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const result = data?.content?.[0]?.text as string | undefined;
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if (!result) return { error: 'Anthropic returned an empty response.' };
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return { result: result.trim() };
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}
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async function callGroqWithPrompt(payload: AnalyzePayload, config: LexAIConfig, systemPrompt: string): Promise<LexAIResponse> {
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const model = config.model || 'llama-3.3-70b-versatile';
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let res: Response;
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try {
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res = await fetchWithTimeout('https://api.groq.com/openai/v1/chat/completions', {
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method: 'POST',
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headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${config.apiKey}` },
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body: JSON.stringify({
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model,
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messages: [
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{ role: 'system', content: systemPrompt },
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{ role: 'user', content: payload.text },
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],
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max_tokens: 1024,
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temperature: 0.7,
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}),
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});
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} catch (err) {
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return { error: `Network error reaching Groq: ${String(err)}` };
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}
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const data = await res.json();
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if (!res.ok) return { error: `Groq error: ${data?.error?.message ?? `HTTP ${res.status}`}` };
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const result = data?.choices?.[0]?.message?.content as string | undefined;
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if (!result) return { error: 'Groq returned an empty response.' };
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return { result: result.trim() };
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}
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async function callOpenRouterWithPrompt(payload: AnalyzePayload, config: LexAIConfig, systemPrompt: string): Promise<LexAIResponse> {
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const model = config.model || 'openai/gpt-4o-mini';
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let res: Response;
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try {
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res = await fetchWithTimeout('https://openrouter.ai/api/v1/chat/completions', {
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method: 'POST',
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headers: {
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'Content-Type': 'application/json',
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Authorization: `Bearer ${config.apiKey}`,
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'HTTP-Referer': 'https://lexai.dev',
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'X-Title': 'LexAI',
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},
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body: JSON.stringify({
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model,
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messages: [
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{ role: 'system', content: systemPrompt },
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{ role: 'user', content: payload.text },
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],
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max_tokens: 1024,
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}),
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});
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} catch (err) {
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return { error: `Network error reaching OpenRouter: ${String(err)}` };
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}
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const data = await res.json();
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if (!res.ok) return { error: `OpenRouter error: ${data?.error?.message ?? `HTTP ${res.status}`}` };
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const result = data?.choices?.[0]?.message?.content as string | undefined;
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if (!result) return { error: 'OpenRouter returned an empty response.' };
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return { result: result.trim() };
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}
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// ─── Main handler ─────────────────────────────────────────────────────────────
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async function handleAnalyzeText(payload: AnalyzePayload): Promise<LexAIResponse> {
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const stored = await chrome.storage.local.get(['provider', 'apiKey', 'apiKeyEnc', 'encKey', 'model']);
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const config = stored as LexAIConfig;
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// Resolve API key — prefer encrypted path, fall back to plaintext for backward compat
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let apiKey = config.apiKey;
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if (config.apiKeyEnc && config.encKey) {
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const decrypted = await decryptApiKey(config.encKey, config.apiKeyEnc);
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if (decrypted) {
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apiKey = decrypted;
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}
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}
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if (!apiKey || apiKey.trim() === '') {
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return { error: 'No API key configured. Please open LexAI settings (click the extension icon).' };
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}
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const resolvedConfig: LexAIConfig = { ...config, apiKey: apiKey.trim() };
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const provider = config.provider || 'openai';
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switch (provider) {
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case 'openai':
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return callOpenAI(payload, resolvedConfig);
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case 'anthropic':
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return callAnthropic(payload, resolvedConfig);
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case 'groq':
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return callGroq(payload, resolvedConfig);
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case 'openrouter':
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return callOpenRouter(payload, resolvedConfig);
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default:
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return { error: `Unknown provider: "${provider}". Please check LexAI settings.` };
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}
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}
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// ─── Background entry ─────────────────────────────────────────────────────────
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export default defineBackground(() => {
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console.log('LexAI background service worker started');
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// ─── Context menus ───────────────────────────────────────────────────────
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chrome.runtime.onInstalled.addListener(() => {
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chrome.contextMenus.create({
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id: 'lexai-grammar',
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title: '⚡ LexAI: Fix Grammar',
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contexts: ['selection'],
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});
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chrome.contextMenus.create({
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id: 'lexai-rephrase',
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title: '⚡ LexAI: Rephrase',
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contexts: ['selection'],
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});
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chrome.contextMenus.create({
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id: 'lexai-shorten',
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title: '⚡ LexAI: Shorten',
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contexts: ['selection'],
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});
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chrome.contextMenus.create({
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id: 'lexai-expand',
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title: '⚡ LexAI: Expand',
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contexts: ['selection'],
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});
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chrome.contextMenus.create({
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id: 'lexai-tone',
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title: '⚡ LexAI: Analyze Tone',
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contexts: ['selection'],
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});
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});
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chrome.contextMenus.onClicked.addListener((info, tab) => {
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if (!info.selectionText || !tab?.id) return;
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const action = info.menuItemId.toString().replace('lexai-', '');
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chrome.tabs.sendMessage(tab.id, {
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type: 'lexai-context-menu',
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action,
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text: info.selectionText,
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});
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});
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// ─── Message handler ─────────────────────────────────────────────────────
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chrome.runtime.onMessage.addListener((message, _sender, sendResponse) => {
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if (message.type === 'ANALYZE_TEXT') {
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handleAnalyzeText(message.payload as AnalyzePayload)
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.then(sendResponse)
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.catch((err) => sendResponse({ error: String(err) }));
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return true; // Keep channel open for async response
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}
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if (message.type === 'COPY_AS') {
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const { text, format } = message as { text: string; format: string };
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chrome.storage.local.get(['provider', 'apiKey', 'apiKeyEnc', 'encKey', 'model'])
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.then(async (stored) => {
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const config = stored as LexAIConfig;
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let apiKey = config.apiKey;
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if (config.apiKeyEnc && config.encKey) {
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const decrypted = await decryptApiKey(config.encKey, config.apiKeyEnc);
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if (decrypted) apiKey = decrypted;
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}
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if (!apiKey || apiKey.trim() === '') {
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sendResponse({ error: 'No API key configured. Please open LexAI settings.' });
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return;
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}
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const resolvedConfig: LexAIConfig = { ...config, apiKey: apiKey.trim() };
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const systemPrompt = `Reformat the following text as ${format}. Return only the reformatted result, no explanation.`;
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return callProvider(resolvedConfig, text, systemPrompt);
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})
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.then((res) => { if (res) sendResponse(res); })
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.catch((err) => sendResponse({ error: String(err) }));
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return true;
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}
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});
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});
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