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eve

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Filesystem-first framework for durable backend AI agents that run anywhere.

github.com/vercel/eve

vercel/eve

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import{createLogger,logError}from"#internal/logging.js";import{hasInternalRefScheme}from"#internal/attachments/url-refs.js";import{EVE_CANCEL_TURN_ROUTE_PATTERN,EVE_INFO_ROUTE_PATH}from"#protocol/routes.js";import{EVE_MESSAGE_STREAM_CONTENT_TYPE,EVE_MESSAGE_STREAM_FORMAT,EVE_MESSAGE_STREAM_VERSION,EVE_SESSION_ID_HEADER,EVE_STREAM_FORMAT_HEADER,EVE_STREAM_VERSION_HEADER}from"#protocol/message.js";import{isInputResponse}from"#runtime/input/types.js";import{parseJsonObject}from"#shared/json.js";import{GET,POST,defineChannel}from"#public/definitions/channel.js";import"ai";import{parseSessionCallback}from"#channel/session-callback.js";import{readAgentInfoRouteResponse,readRouteAgent}from"#internal/nitro/routes/channel-route-context.js";import{routeAuth}from"#public/channels/auth.js";import{collectUploadPolicyViolations,formatUploadPolicyViolation,mergeUploadPolicy}from"#public/channels/upload-policy.js";const log=createLogger(`eve.channel`);function defaultEveAuth(e){return e.eve.caller}function eveChannel(e){let n=mergeUploadPolicy(e.uploadPolicy);return defineChannel({cors:normalizeEveCors(e.cors),routes:[GET(EVE_INFO_ROUTE_PATH,async(t,n)=>{let r=await routeAuth(t,e.auth);if(r instanceof Response)return r;let i=readAgentInfoRouteResponse(n);return i===void 0?Response.json({error:`Agent info route requires internal channel dispatch context.`,ok:!1},{status:500}):await i()}),POST(`/eve/v1/session`,async(t,{send:r})=>{let i=await routeAuth(t,e.auth);if(i instanceof Response)return i;let a=i,o;try{o=await t.json()}catch{return Response.json({error:`Invalid JSON body.`,ok:!1},{status:400})}if(typeof o!=`object`||!o)return Response.json({error:`Expected a JSON object.`,ok:!1},{status:400});let s=parseCreateBody(o);if(s instanceof Response)return s;let c=checkUploadPolicy(s,n);if(c!==null)return c;let l=await resolveOnMessage({auth:a,config:e,message:s.message,request:t});if(l instanceof Response)return l;if(!l.dispatch)return droppedMessageResponse();let u=`eve:${crypto.randomUUID()}`,d=await r(createSendPayload(s,mergeContext(s.context,l.context)),{auth:l.auth,callback:s.callback,continuationToken:u,mode:s.mode});return Response.json({continuationToken:d.continuationToken,ok:!0,sessionId:d.id},{headers:{"cache-control":`no-store`,[EVE_SESSION_ID_HEADER]:d.id},status:202})}),POST(`/eve/v1/session/:sessionId`,async(t,{send:r,getSession:i,params:a})=>{let o=await routeAuth(t,e.auth);if(o instanceof Response)return o;let s=o,c=a.sessionId;if(!c)return Response.json({error:`Missing session id.`,ok:!1},{status:400});try{i(c)}catch{return Response.json({error:`Session not found.`,ok:!1},{status:404})}let l;try{l=await t.json()}catch{return Response.json({error:`Invalid JSON body.`,ok:!1},{status:400})}if(typeof l!=`object`||!l)return Response.json({error:`Expected a JSON object.`,ok:!1},{status:400});let u=parseContinueBody(l);if(u instanceof Response)return u;let d=checkUploadPolicy(u,n);if(d!==null)return d;let f=u.context,p=s;if(u.message!==void 0){let n=await resolveOnMessage({auth:s,config:e,message:u.message,request:t,sessionId:c});if(n instanceof Response)return n;if(!n.dispatch)return droppedMessageResponse();f=mergeContext(u.context,n.context),p=n.auth}let m=await r({inputResponses:u.inputResponses,message:u.message,context:f,outputSchema:u.outputSchema},{auth:p,continuationToken:u.continuationToken});return Response.json({ok:!0,sessionId:m.id},{headers:{"cache-control":`no-store`,[EVE_SESSION_ID_HEADER]:m.id},status:200})}),POST(EVE_CANCEL_TURN_ROUTE_PATTERN,async(n,r)=>{let i=await routeAuth(n,e.auth);if(i instanceof Response)return i;let a=r.params.sessionId;if(!a)return Response.json({error:`Missing session id.`,ok:!1},{status:400});let o=await parseCancelTurnBody(n);if(o instanceof Response)return o;let s;try{let e=readRouteAgent(r);if(e===void 0)throw Error(`Missing route agent.`);s=await e.cancelTurn({sessionId:a,turnId:o.turnId})}catch(e){let n=logError(log,`cancel-turn request failed`,e,{sessionId:a});return Response.json({error:`Failed to cancel the turn.`,errorId:n,ok:!1},{status:500})}return Response.json({ok:!0,sessionId:a,status:s.status},{headers:{"cache-control":`no-store`,[EVE_SESSION_ID_HEADER]:a},status:202})}),GET(`/eve/v1/session/:sessionId/stream`,async(t,{getSession:n,params:r})=>{let i=await routeAuth(t,e.auth);if(i instanceof Response)return i;let u=r.sessionId;if(!u)return Response.json({error:`Missing session id.`,ok:!1},{status:400});let d=parseStartIndex(t);if(d instanceof Response)return d;try{let e=serializeAsNdjson(await n(u).getEventStream({startIndex:d}));return new Response(e,{headers:{"cache-control":`no-store, no-transform`,"content-type":EVE_MESSAGE_STREAM_CONTENT_TYPE,"x-accel-buffering":`no`,[EVE_SESSION_ID_HEADER]:u,[EVE_STREAM_FORMAT_HEADER]:EVE_MESSAGE_STREAM_FORMAT,[EVE_STREAM_VERSION_HEADER]:EVE_MESSAGE_STREAM_VERSION}})}catch{return Response.json({error:`Session not found.`,ok:!1},{status:404})}})],events:e.events})}function normalizeEveCors(e){if(e===void 0||e===!1)return!1;if(e===!0)return!0;let t={};return e.origin!==void 0&&(t.origin=normalizeEveCorsOrigin(e.origin)),e.methods!==void 0&&(t.methods=e.methods),e.allowedHeaders!==void 0&&(t.allowHeaders=e.allowedHeaders),e.exposedHeaders!==void 0&&(t.exposeHeaders=e.exposedHeaders),e.credentials!==void 0&&(t.credentials=e.credentials),e.maxAge!==void 0&&(t.maxAge=e.maxAge),e.preflightStatus!==void 0&&(t.preflight={statusCode:e.preflightStatus}),t}function normalizeEveCorsOrigin(e){return e===`*`||e===`null`?e:typeof e==`string`?[e]:e}async function resolveOnMessage(e){let n=e.config.onMessage??defaultOnMessage,r;try{r=await n({eve:e.sessionId===void 0?{caller:e.auth,request:e.request}:{caller:e.auth,request:e.request,sessionId:e.sessionId}},e.message)}catch(n){let r=logError(log,`onMessage handler failed`,n,{sessionId:e.sessionId});return Response.json({error:`onMessage handler failed.`,errorId:r,ok:!1},{status:500})}return r==null?{dispatch:!1}:r.context===void 0?{auth:r.auth,dispatch:!0}:{auth:r.auth,context:r.context,dispatch:!0}}function defaultOnMessage(e){return{auth:defaultEveAuth(e)}}function droppedMessageResponse(){return new Response(null,{headers:{"cache-control":`no-store`},status:204})}function parseCreateBody(e){let t=parseMessageField(e.message);if(t instanceof Response)return t;let n=parseClientContextField(e.clientContext);if(n instanceof Response)return n;let r=parseCallbackField(e.callback);if(r instanceof Response)return r;let i=parseModeField(e.mode);if(i instanceof Response)return i;let a=parseOutputSchemaField(e.outputSchema);return a instanceof Response?a:t===void 0?Response.json({error:`Missing or empty 'message' field.`,ok:!1},{status:400}):{callback:r,message:t,mode:i,context:n,outputSchema:a}}function parseContinueBody(e){let t=typeof e.continuationToken==`string`&&e.continuationToken.length>0?e.continuationToken:void 0;if(t===void 0)return Response.json({error:`Missing or empty 'continuationToken' field.`,ok:!1},{status:400});let n=parseMessageField(e.message);if(n instanceof Response)return n;let r=parseInputResponses(e.inputResponses);if(r instanceof Response)return r;let i=parseClientContextField(e.clientContext);if(i instanceof Response)return i;let a=parseOutputSchemaField(e.outputSchema);return a instanceof Response?a:n===void 0&&r===void 0?Response.json({error:`Expected a non-empty 'message', a non-empty 'inputResponses' array, or both.`,ok:!1},{status:400}):{message:n,continuationToken:t,inputResponses:r,context:i,outputSchema:a}}async function parseCancelTurnBody(e){let t;try{t=await e.text()}catch{return Response.json({error:`Unreadable request body.`,ok:!1},{status:400})}if(t.trim().length===0)return{};let n;try{n=JSON.parse(t)}catch{return Response.json({error:`Invalid JSON body.`,ok:!1},{status:400})}if(typeof n!=`object`||!n||Array.isArray(n))return Response.json({error:`Expected a JSON object.`,ok:!1},{status:400});let r=n.turnId;return r===void 0?{}:typeof r!=`string`||r.length===0?Response.json({error:`Expected 'turnId' to be a non-empty string.`,ok:!1},{status:400}):{turnId:r}}function createSendPayload(e,t=e.context){if(t===void 0&&e.outputSchema===void 0)return e.message;let n={message:e.message};return t!==void 0&&(n.context=t),e.outputSchema!==void 0&&(n.outputSchema=e.outputSchema),n}function parseOutputSchemaField(e){if(e!==void 0)try{return parseJsonObject(e)}catch{return Response.json({error:`Expected 'outputSchema' to be a JSON-serializable object.`,ok:!1},{status:400})}}function parseCallbackField(e){if(e===void 0)return;let t=parseSessionCallback(e);return t.ok?t.callback:Response.json({error:t.message,ok:!1},{status:400})}function parseModeField(e){if(e!==void 0)return e===`conversation`||e===`task`?e:Response.json({error:`Expected 'mode' to be either 'conversation' or 'task'.`,ok:!1},{status:400})}function parseMessageField(e){if(e===void 0)return;if(typeof e==`string`)return e.length>0?e:void 0;if(!Array.isArray(e))return Response.json({error:`Expected 'message' to be a string or an array of text/file parts.`,ok:!1},{status:400});if(e.length===0)return;let t=[];for(let n of e){let e=parseMessagePart(n);if(e instanceof Response)return e;t.push(e)}return t}function parseMessagePart(e){if(typeof e!=`object`||!e)return Response.json({error:`Expected each message part to be an object.`,ok:!1},{status:400});let t=e;if(t.type===`text`)return typeof t.text!=`string`||t.text.length===0?Response.json({error:`Text parts require a non-empty 'text' string.`,ok:!1},{status:400}):{type:`text`,text:t.text};if(t.type===`file`){if(typeof t.mediaType!=`string`||t.mediaType.length===0)return Response.json({error:`File parts require a non-empty 'mediaType' string.`,ok:!1},{status:400});if(typeof t.data!=`string`)return Response.json({error:`File parts require a 'data' string (base64, data URL, or URL).`,ok:!1},{status:400});if(hasInternalRefScheme(t.data))return Response.json({error:`File part 'data' must not use a framework-internal ref scheme.`,ok:!1},{status:400});let e={type:`file`,mediaType:t.mediaType,data:t.data};return typeof t.filename==`string`&&t.filename.length>0&&(e.filename=t.filename),e}return Response.json({error:`Unsupported message part type "${String(t.type)}". Use 'text' or 'file'.`,ok:!1},{status:400})}function checkUploadPolicy(e,t){if(!e.message)return null;let n=collectUploadPolicyViolations(e.message,t);if(n.length===0)return null;let[r]=n;if(!r)return null;let i=r.kind===`too-large`?413:415;return Response.json({error:formatUploadPolicyViolation(r),ok:!1,violations:n.map(e=>e.kind===`too-large`?{byteLength:e.byteLength,filename:e.filename,kind:e.kind,limit:e.limit,mediaType:e.mediaType}:{allowedMediaTypes:e.allowedMediaTypes,filename:e.filename,kind:e.kind,mediaType:e.mediaType})},{status:i})}function parseInputResponses(e){if(e===void 0)return;if(!Array.isArray(e)||e.length===0)return Response.json({error:`Expected 'inputResponses' to be a non-empty array.`,ok:!1},{status:400});let t=e.filter(isInputResponse);return t.length===e.length?t:Response.json({error:`Expected every 'inputResponses' entry to match the HITL response schema.`,ok:!1},{status:400})}function mergeContext(e,t){return e===void 0?t:t===void 0?e:[...e,...t]}function parseClientContextField(e){if(e!==void 0){if(typeof e==`string`)return e.length>0?[toClientContextMessage(e)]:void 0;if(Array.isArray(e))return e.length===0?void 0:e.every(e=>typeof e==`string`&&e.length>0)?e.map(e=>toClientContextMessage(e)):Response.json({error:`Expected 'clientContext' array entries to be non-empty strings.`,ok:!1},{status:400});if(typeof e!=`object`||!e)return Response.json({error:`Expected 'clientContext' to be a string, string array, or JSON object.`,ok:!1},{status:400});try{let t=parseJsonObject(e);return[toClientContextMessage(JSON.stringify(t))]}catch{return Response.json({error:`Expected 'clientContext' to be a JSON-serializable object.`,ok:!1},{status:400})}}}function toClientContextMessage(e){return`Client context: ${e}`}function parseStartIndex(e){let t=new URL(e.url).searchParams.get(`startIndex`);if(t===null)return;let n=Number(t);return!/^-?\d+$/.test(t)||!Number.isSafeInteger(n)?Response.json({error:`Expected startIndex to be an integer.`,ok:!1},{status:400}):n}function serializeAsNdjson(e){let t=new TextEncoder;return e.pipeThrough(new TransformStream({start(e){e.enqueue(t.encode(` `))},transform(e,n){n.enqueue(t.encode(`${JSON.stringify(e)}\n`))}}))}export{defaultEveAuth,eveChannel};