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silverbullet/server/http_server.ts

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import { Application, path, Router } from "./deps.ts";
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import { Manifest } from "../common/manifest.ts";
import { SpacePrimitives } from "../common/spaces/space_primitives.ts";
import { EndpointHook } from "../plugos/hooks/endpoint.ts";
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import { AssetBundle } from "../plugos/asset_bundle/bundle.ts";
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import { SpaceSystem } from "./space_system.ts";
import { parseYamlSettings } from "../common/util.ts";
export type ServerOptions = {
hostname: string;
port: number;
pagesPath: string;
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dbPath: string;
assetBundle: AssetBundle;
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user?: string;
pass?: string;
};
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const staticLastModified = new Date().toUTCString();
export class HttpServer {
app: Application;
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systemBoot: SpaceSystem;
private hostname: string;
private port: number;
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user?: string;
settings: { [key: string]: any } = {};
abortController?: AbortController;
constructor(options: ServerOptions) {
this.hostname = options.hostname;
this.port = options.port;
this.app = new Application(); //{ serverConstructor: FlashServer });
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this.user = options.user;
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this.systemBoot = new SpaceSystem(
options.assetBundle,
options.pagesPath,
options.dbPath,
);
// Second, for loading plug JSON files with absolute or relative (from CWD) paths
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this.systemBoot.eventHook.addLocalListener(
"get-plug:file",
async (plugPath: string): Promise<Manifest> => {
const resolvedPath = path.resolve(plugPath);
try {
const manifestJson = await Deno.readTextFile(resolvedPath);
return JSON.parse(manifestJson);
} catch {
throw new Error(
`No such file: ${resolvedPath} or could not parse as JSON`,
);
}
},
);
// Rescan disk every 5s to detect any out-of-process file changes
setInterval(() => {
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this.systemBoot.space.updatePageList().catch(console.error);
}, 5000);
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// Register the HTTP endpoint hook (with "/_/<plug-name>"" prefix, hardcoded for now)
this.systemBoot.system.addHook(new EndpointHook(this.app, "/_"));
}
async start() {
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await this.systemBoot.start();
await this.systemBoot.ensureSpaceIndex();
await this.ensureAndLoadSettings();
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// Serve static files (javascript, css, html)
this.app.use(async ({ request, response }, next) => {
if (request.url.pathname === "/") {
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if (request.headers.get("If-Modified-Since") === staticLastModified) {
response.status = 304;
return;
}
response.headers.set("Content-type", "text/html");
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response.body = this.systemBoot.assetBundle.readTextFileSync(
"web/index.html",
);
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response.headers.set("Last-Modified", staticLastModified);
return;
}
try {
const assetName = `web${request.url.pathname}`;
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if (
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this.systemBoot.assetBundle.has(assetName) &&
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request.headers.get("If-Modified-Since") === staticLastModified
) {
response.status = 304;
return;
}
response.status = 200;
response.headers.set(
"Content-type",
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this.systemBoot.assetBundle.getMimeType(assetName),
);
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const data = this.systemBoot.assetBundle.readFileSync(
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assetName,
);
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response.headers.set("Cache-Control", "no-cache");
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response.headers.set("Content-length", "" + data.length);
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response.headers.set("Last-Modified", staticLastModified);
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if (request.method === "GET") {
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response.body = data;
}
} catch {
await next();
}
});
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this.addPasswordAuth(this.app);
// Pages API
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const fsRouter = this.buildFsRouter(this.systemBoot.spacePrimitives);
this.app.use(fsRouter.routes());
this.app.use(fsRouter.allowedMethods());
// Plug API
const plugRouter = this.buildPlugRouter();
this.app.use(plugRouter.routes());
this.app.use(plugRouter.allowedMethods());
// Fallback, serve index.html
this.app.use((ctx) => {
ctx.response.headers.set("Content-type", "text/html");
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ctx.response.body = this.systemBoot.assetBundle.readTextFileSync(
"web/index.html",
);
});
this.abortController = new AbortController();
this.app.listen({ hostname: this.hostname, port: this.port, signal: this.abortController.signal })
.catch((e: any) => {
console.log("Server listen error:", e.message);
Deno.exit(1);
});
const visibleHostname = this.hostname === "0.0.0.0" ? "localhost" : this.hostname;
console.log(
`Silver Bullet is now running: http://${visibleHostname}:${this.port}`,
);
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}
async ensureAndLoadSettings() {
const space = this.systemBoot.space;
try {
await space.getPageMeta("SETTINGS");
} catch {
await space.writePage(
"SETTINGS",
this.systemBoot.assetBundle.readTextFileSync("SETTINGS_template.md"),
true,
);
}
const { text: settingsText } = await space.readPage("SETTINGS");
const settings = parseYamlSettings(settingsText);
if (!settings.indexPage) {
settings.indexPage = "index";
}
try {
await space.getPageMeta(settings.indexPage);
} catch {
await space.writePage(
settings.indexPage,
`Welcome to your new space!`,
);
}
}
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private addPasswordAuth(app: Application) {
if (this.user) {
app.use(async ({ request, response }, next) => {
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if (
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request.headers.get("Authorization") ===
`Basic ${btoa(this.user!)}`
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) {
await next();
} else {
response.status = 401;
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response.headers.set(
"WWW-Authenticate",
`Basic realm="Please enter your username and password"`,
);
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response.body = "Unauthorized";
}
});
}
}
private buildFsRouter(spacePrimitives: SpacePrimitives): Router {
const fsRouter = new Router();
// File list
fsRouter.get("/", async ({ response }) => {
response.headers.set("Content-type", "application/json");
response.body = JSON.stringify(await spacePrimitives.fetchFileList());
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});
fsRouter
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.get("\/(.+)", async ({ params, response, request }) => {
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const name = params[0];
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// console.log("Loading file", name);
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try {
const attachmentData = await spacePrimitives.readFile(
name,
"arraybuffer",
);
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const lastModifiedHeader = new Date(attachmentData.meta.lastModified)
.toUTCString();
if (request.headers.get("If-Modified-Since") === lastModifiedHeader) {
response.status = 304;
return;
}
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response.status = 200;
response.headers.set(
"X-Last-Modified",
"" + attachmentData.meta.lastModified,
);
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response.headers.set("Cache-Control", "no-cache");
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response.headers.set("X-Permission", attachmentData.meta.perm);
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response.headers.set(
"Last-Modified",
lastModifiedHeader,
);
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response.headers.set("Content-Type", attachmentData.meta.contentType);
response.body = attachmentData.data as ArrayBuffer;
} catch {
// console.error("Error in main router", e);
response.status = 404;
response.body = "";
}
})
.put("\/(.+)", async ({ request, response, params }) => {
const name = params[0];
console.log("Saving file", name);
try {
const meta = await spacePrimitives.writeFile(
name,
"arraybuffer",
await request.body().value,
false,
);
response.status = 200;
response.headers.set("Content-Type", meta.contentType);
response.headers.set("X-Last-Modified", "" + meta.lastModified);
response.headers.set("X-Content-Length", "" + meta.size);
response.headers.set("X-Permission", meta.perm);
response.body = "OK";
} catch (err) {
response.status = 500;
response.body = "Write failed";
console.error("Pipeline failed", err);
}
})
.options("\/(.+)", async ({ response, params }) => {
const name = params[0];
try {
const meta = await spacePrimitives.getFileMeta(name);
response.status = 200;
response.headers.set("Content-Type", meta.contentType);
response.headers.set("X-Last-Modified", "" + meta.lastModified);
response.headers.set("X-Content-Length", "" + meta.size);
response.headers.set("X-Permission", meta.perm);
} catch {
response.status = 404;
response.body = "File not found";
// console.error("Options failed", err);
}
})
.delete("\/(.+)", async ({ response, params }) => {
const name = params[0];
try {
await spacePrimitives.deleteFile(name);
response.status = 200;
response.body = "OK";
} catch (e: any) {
console.error("Error deleting attachment", e);
response.status = 200;
response.body = e.message;
}
});
return new Router().use("/fs", fsRouter.routes());
}
private buildPlugRouter(): Router {
const plugRouter = new Router();
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// this.addPasswordAuth(plugRouter);
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const system = this.systemBoot.system;
plugRouter.post(
"/:plug/syscall/:name",
async (ctx) => {
const name = ctx.params.name;
const plugName = ctx.params.plug;
const args = await ctx.request.body().value;
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const plug = system.loadedPlugs.get(plugName);
if (!plug) {
ctx.response.status = 404;
ctx.response.body = `Plug ${plugName} not found`;
return;
}
try {
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const result = await system.syscallWithContext(
{ plug },
name,
args,
);
ctx.response.headers.set("Content-Type", "application/json");
ctx.response.body = JSON.stringify(result);
} catch (e: any) {
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console.log("Error", e);
ctx.response.status = 500;
ctx.response.body = e.message;
return;
}
},
);
plugRouter.post(
"/:plug/function/:name",
async (ctx) => {
const name = ctx.params.name;
const plugName = ctx.params.plug;
const args = await ctx.request.body().value;
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const plug = system.loadedPlugs.get(plugName);
if (!plug) {
ctx.response.status = 404;
ctx.response.body = `Plug ${plugName} not found`;
return;
}
try {
const result = await plug.invoke(name, args);
ctx.response.headers.set("Content-Type", "application/json");
ctx.response.body = JSON.stringify(result);
} catch (e: any) {
ctx.response.status = 500;
// console.log("Error invoking function", e);
ctx.response.body = e.message;
}
},
);
return new Router().use("/plug", plugRouter.routes());
}
async stop() {
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const system = this.systemBoot.system;
if (this.abortController) {
console.log("Stopping");
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await system.unloadAll();
console.log("Stopped plugs");
this.abortController.abort();
console.log("stopped server");
}
}
}