feat: include directive for condense_text endpoint

README.md

@@ -1,25 +1,5 @@
-# Cloudflare Workers OpenAPI 3.1
+# Bluesky Alt Text Worker
 
-This is a Cloudflare Worker with OpenAPI 3.1 using [chanfana](https://github.com/cloudflare/chanfana) and [Hono](https://github.com/honojs/hono).
+A Cloudflare Worker which works in conjunction with https://github.com/indexxing/Bluesky-Alt-Text. All endpoints are based off the original cloud function made by [symmetricalboy](https://github.com/symmetricalboy) [here](https://github.com/symmetricalboy/gen-alt-text/blob/main/functions/index.js), just in Typescript and prepackaged into a Cloudflare Worker environment.
 
-This is an example project made to be used as a quick start into building OpenAPI compliant Workers that generates the
-`openapi.json` schema automatically from code and validates the incoming request to the defined parameters or request body.
-
-## Get started
-
-1. Sign up for [Cloudflare Workers](https://workers.dev). The free tier is more than enough for most use cases.
-2. Clone this project and install dependencies with `npm install`
-3. Run `wrangler login` to login to your Cloudflare account in wrangler
-4. Run `wrangler deploy` to publish the API to Cloudflare Workers
-
-## Project structure
-
-1. Your main router is defined in `src/index.ts`.
-2. Each endpoint has its own file in `src/endpoints/`.
-3. For more information read the [chanfana documentation](https://chanfana.pages.dev/) and [Hono documentation](https://hono.dev/docs).
-
-## Development
-
-1. Run `wrangler dev` to start a local instance of the API.
-2. Open `http://localhost:8787/` in your browser to see the Swagger interface where you can try the endpoints.
-3. Changes made in the `src/` folder will automatically trigger the server to reload, you only need to refresh the Swagger interface.
+Documentation is served at the root of the worker deployment. There is a root path variable specified in the entrypoint file because my setup involves using a worker route wildcard on my custom domain.

src/endpoints/condense_text.ts

@@ -1,10 +1,10 @@
-import { Num, OpenAPIRoute } from "chanfana";
+import { Enumeration, Num, OpenAPIRoute } from "chanfana";
 import { z } from "zod";
 import { type AppContext } from "../types";
 
 export class CondenseTextEndpoint extends OpenAPIRoute {
 	schema = {
-		tags: ["AltText"],
+		tags: ["Processing"],
 		summary: "Condense a given text based on a directive",
 		security: [
 			{
@@ -21,17 +21,11 @@ export class CondenseTextEndpoint extends OpenAPIRoute {
 								required_error:
 									"Text is required for condensation.",
 							}).min(1, "Text cannot be empty."),
-							directive: z.string({
+							mediaType: z.enum(["video", "image"], {
 								description:
-									"Instructions for condensing the text (e.g., 'Summarize this article', 'Extract keywords').",
-								required_error:
-									"A condensation directive is required.",
-							}).min(1, "Directive cannot be empty."),
-							targetLength: Num({
-								description:
-									"The approximate target length for the condensed text (e.g., number of sentences, characters, or words).",
-								default: 200,
-							}).optional(),
+									"The type of media being described",
+								required_error: "Media type is required.",
+							}),
 						}),
 					},
 				},
@@ -67,7 +61,9 @@ export class CondenseTextEndpoint extends OpenAPIRoute {
 
 	async handle(c: AppContext) {
 		const data = await this.getValidatedData<typeof this.schema>();
-		const { text, directive, targetLength } = data.body;
+		const { text, mediaType } = data.body;
+
+		const targetLength = c.env.MAX_ALT_TEXT_LENGTH - 100;
 
 		try {
 			const res = await c.var.gemini.models.generateContent({
@@ -75,7 +71,10 @@ export class CondenseTextEndpoint extends OpenAPIRoute {
 				model: "gemini-2.0-flash-lite",
 				contents: [{
 					parts: [
-						{ text: directive },
+						{
+							text:
+								`You are an expert at writing concise, informative alt text. Please condense the following ${mediaType} description to be no more than ${targetLength} characters while preserving the most important details. The description needs to be accessible and useful for screen readers:`,
+						},
 						{ text: text },
 					],
 				}],

src/endpoints/generate.ts

@@ -48,7 +48,7 @@ By consistently applying these guidelines, you will create alt-text that is info
 
 export class GenerateEndpoint extends OpenAPIRoute {
     schema = {
-        tags: ["AltText"],
+        tags: ["Image"],
         summary: "Generates alt text for a given image.",
         security: [
             {

src/index.ts

@@ -9,7 +9,9 @@ import { authMiddleware } from "./middleware/auth";
 import { Env, Variables } from "./types";
 
 const app = new Hono<{ Bindings: Env; Variables: Variables }>();
-const root = "/api/altText";
+
+// The path which all routes are served from, for easy use with Worker Routes on custom domains.
+const rootPath = "/api/altText/";
 
 app.use(
 	"*",
@@ -36,26 +38,17 @@ app.use(
 	}),
 );
 
-app.use(root + "/generate", authMiddleware);
-app.use(root + "/condense_text", authMiddleware);
-app.use("*", geminiMiddleware);
-
 const openapi = fromHono(app, {
 	schema: {
 		info: {
-			title: "Alt Text Generator",
+			title: "Bluesky Alt Text",
 			description:
-				"Endpoints for my Bluesky alt text generator browser extension.",
+				"Endpoints for https://github.com/indexxing/Bluesky-Alt-Text",
 			version: "1.0",
 		},
-		servers: [
-			{
-				url: "https://indexx.dev/api/altText",
-			},
-		],
 	},
-	docs_url: root + "/",
-	openapi_url: root + "/openapi.json",
+	docs_url: rootPath,
+	openapi_url: rootPath + "openapi.json",
 });
 
 openapi.registry.registerComponent("securitySchemes", "apiKey", {
@@ -64,7 +57,13 @@ openapi.registry.registerComponent("securitySchemes", "apiKey", {
 	in: "header",
 });
 
-openapi.post(root + "/generate", GenerateEndpoint);
-openapi.post(root + "/condense_text", CondenseTextEndpoint);
+// Define Routes
+openapi.post(rootPath + "generate", GenerateEndpoint);
+openapi.post(rootPath + "condense_text", CondenseTextEndpoint);
+
+// Define Middlewares
+app.use("*", geminiMiddleware);
+app.use(rootPath + "generate", authMiddleware);
+app.use(rootPath + "condense_text", authMiddleware);
 
 export default app;

src/middleware/auth.ts

@@ -1,8 +1,8 @@
 import { Context, Next } from "hono";
-import { Env } from "../types";
+import { Env, Variables } from "../types";
 
 export async function authMiddleware(
-    c: Context<{ Bindings: Env }>,
+    c: Context<{ Bindings: Env; Variables: Variables }>,
     next: Next,
 ) {
     const authToken = c.req.header("Authorization");

src/types.ts

@@ -6,6 +6,12 @@ import type { GoogleGenAI } from "@google/genai";
 export type AppContext = Context<{ Bindings: Env; Variables: Variables }>;
 
 export interface Env {
+	// Environmental Variables
+	MAX_ALT_TEXT_LENGTH: number;
+	ABSOLUTE_MAX_LENGTH: number;
+	MAX_DIRECT_BLOB_SIZE: number;
+
+	// Secrets
 	AUTH_TOKEN: string;
 	GEMINI_API_KEY: string;
 }

wrangler.jsonc

@@ -1,6 +1,6 @@
 {
   "$schema": "node_modules/wrangler/config-schema.json",
-  "name": "bluesky-alt-text-worker",
+  "name": "bluesky-alt-text",
   "main": "src/index.ts",
   "compatibility_date": "2025-06-07",
   "observability": {
@@ -8,5 +8,10 @@
     "logs": {
       "invocation_logs": true
     }
+  },
+  "vars": {
+    "MAX_ALT_TEXT_LENGTH": 2000,
+    "ABSOLUTE_MAX_LENGTH": 5000,
+    "MAX_DIRECT_BLOB_SIZE": 5242880
   }
 }