d3ro-voice/server/supabase/functions/llm-proxy/index.ts
2026-08-29 18:33:45 +09:00

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// server/supabase/functions/llm-proxy/index.ts
// Anthropic Claude Messages API 프록시.
// Phase 3.2: 모델별 쿼터 (Haiku/Sonnet/Opus × Free/Pro/Pro+)
// 요청: application/json { messages, system?, max_tokens?, model? }
// 응답: JSON (non-stream) 또는 SSE (stream=true)
import { corsHeaders, handleCorsPreflightRequest } from '../_shared/cors.ts'
import { requireUser, authErrorResponse, type AuthError } from '../_shared/auth.ts'
import {
checkQuota,
consumeQuota,
createServiceRoleClient,
modelToQuotaKey,
getQuotaPolicy,
type Tier,
} from '../_shared/quota.ts'
import {
hasAssistantText,
LlmRequestError,
parseLlmRequest,
} from '../_shared/llm-contract.ts'
import {
GENERATION_ID_HEADER,
GENERATION_PURPOSE_HEADER,
GenerationReceiptError,
parseGenerationPurpose,
parseGenerationReceiptId,
type GenerationPurpose,
} from '../_shared/generation-receipt.ts'
import { buildAnthropicSystemBlocks } from '../_shared/generative-ai-safety.ts'
/** 티어별 허용 모델 — free는 Haiku만, pro는 +Sonnet, pro_plus는 +Opus, team/enterprise는 전 모델 */
const TIER_MODELS: Record<Tier, string[]> = {
free: ['claude-haiku-4-5-20251001'],
pro: ['claude-haiku-4-5-20251001', 'claude-sonnet-4-6', 'claude-opus-4-6'],
pro_plus: ['claude-haiku-4-5-20251001', 'claude-sonnet-4-6', 'claude-opus-4-6'],
team: ['claude-haiku-4-5-20251001', 'claude-sonnet-4-6', 'claude-opus-4-6'],
enterprise: ['claude-haiku-4-5-20251001', 'claude-sonnet-4-6', 'claude-opus-4-6'],
}
const DEFAULT_MODEL: Record<Tier, string> = {
free: 'claude-haiku-4-5-20251001',
pro: 'claude-sonnet-4-6',
pro_plus: 'claude-sonnet-4-6',
team: 'claude-sonnet-4-6',
enterprise: 'claude-sonnet-4-6',
}
async function issueGenerationReceipt(
serviceClient: ReturnType<typeof createServiceRoleClient>,
userId: string,
purpose: GenerationPurpose | null,
model: string,
): Promise<string | null> {
if (purpose === null) return null
const { data, error } = await serviceClient.rpc('issue_content_generation_receipt_v1', {
p_actor_id: userId,
p_purpose: purpose,
p_model: model,
})
if (error) {
console.error('Generation receipt issuance failed', { code: error.code ?? 'unknown' })
throw new GenerationReceiptError('generation_receipt_unavailable')
}
return parseGenerationReceiptId(data)
}
function generationHeaders(generationId: string | null): Record<string, string> {
return generationId === null ? {} : { [GENERATION_ID_HEADER]: generationId }
}
Deno.serve(async (req: Request) => {
const preflight = handleCorsPreflightRequest(req)
if (preflight) return preflight
if (req.method !== 'POST') {
return new Response(JSON.stringify({ error: 'Method not allowed' }), {
status: 405,
headers: { ...corsHeaders, 'Content-Type': 'application/json' },
})
}
try {
const user = await requireUser(req)
const serviceClient = createServiceRoleClient()
let rawBody: unknown
try {
rawBody = await req.json()
} catch {
throw new LlmRequestError('Invalid JSON body')
}
const body = parseLlmRequest(rawBody)
const generationPurpose = parseGenerationPurpose(
req.headers.get(GENERATION_PURPOSE_HEADER),
)
// A deployment without a provider must not consume quota or fabricate an answer.
const anthropicKey = Deno.env.get('ANTHROPIC_API_KEY')?.trim() ?? ''
if (!anthropicKey) {
return new Response(JSON.stringify({ error: 'provider_unavailable' }), {
status: 503,
headers: { ...corsHeaders, 'Content-Type': 'application/json', 'Cache-Control': 'no-store' },
})
}
// 1단계: 티어 조회 (어떤 모델이든 한 번만 읽으면 됨 — haiku로 대리 조회)
const tierCheck = await checkQuota(user.id, 'llm_haiku', serviceClient)
const tier = tierCheck.tier
// 모델 선택 + 티어 검증
const requestedModel = body.model ?? DEFAULT_MODEL[tier]
if (!TIER_MODELS[tier].includes(requestedModel)) {
return new Response(
JSON.stringify({
error: 'model_not_allowed',
tier,
requested: requestedModel,
allowed: TIER_MODELS[tier],
}),
{
status: 403,
headers: { ...corsHeaders, 'Content-Type': 'application/json' },
},
)
}
// 2단계: 해당 모델의 쿼터 확인 (모델별 일간/주간)
const quotaKey = modelToQuotaKey(requestedModel)
const modelQuota = await checkQuota(user.id, quotaKey, serviceClient)
if (!modelQuota.allowed) {
return new Response(
JSON.stringify({
error: 'quota_exceeded',
model: requestedModel,
current: modelQuota.current,
limit: modelQuota.limit,
period: modelQuota.period,
tier,
overage_credits: modelQuota.overageCredits,
}),
{
status: 429,
headers: { ...corsHeaders, 'Content-Type': 'application/json' },
},
)
}
// 3단계: 쿼터 소비 (원자적 base → overage fallback)
const policy = getQuotaPolicy(tier, quotaKey)
const consume = await consumeQuota(user.id, quotaKey, serviceClient, policy.limit)
if (!consume.allowed) {
return new Response(
JSON.stringify({
error: 'quota_exceeded',
model: requestedModel,
current: consume.current,
limit: consume.limit,
tier,
overage_credits: consume.overageCredits,
}),
{
status: 429,
headers: { ...corsHeaders, 'Content-Type': 'application/json' },
},
)
}
// 실제 Anthropic API 호출 (Prompt Caching 2024-07-31 활성화)
const systemPayload = buildAnthropicSystemBlocks(body.system)
const anthropicResp = await fetch('https://api.anthropic.com/v1/messages', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
'x-api-key': anthropicKey,
'anthropic-version': '2023-06-01',
'anthropic-beta': 'prompt-caching-2024-07-31',
},
body: JSON.stringify({
model: requestedModel,
max_tokens: body.max_tokens,
system: systemPayload,
messages: body.messages,
stream: body.stream,
}),
signal: AbortSignal.timeout(45_000),
})
if (!anthropicResp.ok) {
console.error('Anthropic request failed', { status: anthropicResp.status })
return new Response(JSON.stringify({ error: 'provider_request_failed' }), {
status: 502,
headers: { ...corsHeaders, 'Content-Type': 'application/json', 'Cache-Control': 'no-store' },
})
}
if (body.stream && anthropicResp.body) {
const generationId = await issueGenerationReceipt(
serviceClient,
user.id,
generationPurpose,
requestedModel,
)
return new Response(anthropicResp.body, {
status: 200,
headers: {
...corsHeaders,
...generationHeaders(generationId),
'Content-Type': 'text/event-stream',
'Cache-Control': 'no-store',
Connection: 'keep-alive',
},
})
}
const data: unknown = await anthropicResp.json()
if (!hasAssistantText(data)) {
console.error('Anthropic returned an invalid response shape')
return new Response(JSON.stringify({ error: 'provider_invalid_response' }), {
status: 502,
headers: { ...corsHeaders, 'Content-Type': 'application/json', 'Cache-Control': 'no-store' },
})
}
const generationId = await issueGenerationReceipt(
serviceClient,
user.id,
generationPurpose,
requestedModel,
)
return new Response(JSON.stringify(data), {
status: 200,
headers: {
...corsHeaders,
...generationHeaders(generationId),
'Content-Type': 'application/json',
'Cache-Control': 'no-store',
},
})
} catch (err) {
if (err instanceof GenerationReceiptError) {
const invalidPurpose = err.code === 'invalid_generation_purpose'
return new Response(JSON.stringify({
error: invalidPurpose ? 'invalid_request' : 'generation_receipt_unavailable',
}), {
status: invalidPurpose ? 400 : 503,
headers: { ...corsHeaders, 'Content-Type': 'application/json', 'Cache-Control': 'no-store' },
})
}
if (err instanceof LlmRequestError) {
return new Response(JSON.stringify({ error: 'invalid_request', message: err.message }), {
status: err.status,
headers: { ...corsHeaders, 'Content-Type': 'application/json', 'Cache-Control': 'no-store' },
})
}
if (err && typeof err === 'object' && 'status' in err && 'message' in err) {
return authErrorResponse(err as AuthError, corsHeaders)
}
const timedOut = err instanceof DOMException && err.name === 'TimeoutError'
console.error('llm-proxy failed', { kind: timedOut ? 'provider_timeout' : 'internal_error' })
return new Response(JSON.stringify({ error: timedOut ? 'provider_timeout' : 'internal_error' }), {
status: timedOut ? 504 : 500,
headers: { ...corsHeaders, 'Content-Type': 'application/json', 'Cache-Control': 'no-store' },
})
}
})