able-baker/run-serve.tsx

336 lines
10 KiB
TypeScript

import * as MIME from "https://deno.land/std@0.180.0/media_types/mod.ts";
import * as HTTP from "https://deno.land/std@0.177.0/http/server.ts";
import * as SWCW from "https://esm.sh/@swc/wasm-web@1.3.62";
type DenoConfig = {imports:Record<string, string>};
const ImportMap:DenoConfig = {imports:{}};
let ImportMapOriginal = {};
const ImportMapReload =async()=>
{
let json:DenoConfig;
const path = Configuration.Proxy+"/deno.json";
try
{
const resp = await fetch(path);
json = await resp.json();
if(!json?.imports)
{ throw new Error("imports not specified in deno.json") }
ImportMapOriginal = json;
}
catch(e)
{
console.log(`error reading deno config "${path}" message:"${e}"`);
return;
}
Object.entries(json.imports).forEach(([key, value])=>
{
if(value.startsWith("./"))
{
json.imports[key] = value.substring(1);
}
});
/*
const mapKey = (Configuration.Spoof.startsWith("/") ? Configuration.Spoof.substring(1) : Configuration.Spoof)+"/";
if(!json.imports[mapKey])
{
console.log(`"${mapKey}" specifier not defined in import map`);
}
json.imports[mapKey] = Configuration.Spoof+"/";
*/
if(!json.imports["react"])
{
console.log(`"react" specifier not defined in import map`);
}
ImportMap.imports = Configuration.Remap(json.imports, Configuration);
console.log(ImportMap.imports);
};
type CustomHTTPHandler = (inReq:Request, inURL:URL, inExt:string|false, inMap:{imports:Record<string, string>}, inConfig:Configuration)=>void|false|Response|Promise<Response|void|false>;
type CustomRemapper = (inImports:Record<string, string>, inConfig:Configuration)=>Record<string, string>;
type Configuration = {Proxy:string, Spoof:string, Allow:string, Reset:string, SWCOp:SWCW.Options, Serve:CustomHTTPHandler, Shell:CustomHTTPHandler, Remap:CustomRemapper};
type ConfigurationArgs = {Proxy?:string, Spoof?:string, Allow?:string, Reset?:string, SWCOp?:SWCW.Options, Serve?:CustomHTTPHandler, Shell?:CustomHTTPHandler, Remap?:CustomRemapper};
let Configuration:Configuration =
{
Proxy: new URL(`file://${Deno.cwd().replaceAll("\\", "/")}`).toString(),
Allow: "*",
Reset: "/clear-cache",
Spoof: "/@able",
async Serve(inReq, inURL, inExt, inMap, inConfig)
{
if( inReq.headers.get("user-agent")?.startsWith("Deno") || inURL.searchParams.get("deno") )
{
if(inExt && Extension(inExt))
{
const text = await Transpile.Patch(inConfig.Proxy + inURL.pathname, "deno-"+inURL.pathname, inMap);
return new Response(text, {headers:{"content-type":"application/javascript"}} );
}
}
},
Remap: (inImports, inConfig)=>
{
const reactURL = inImports["react"];
const setting = Configuration.SWCOp?.jsc?.transform?.react;
if(setting && reactURL)
{
setting.importSource = reactURL;
}
return inImports;
},
Shell(inReq, inURL, inExt, inMap, inConfig)
{
const parts = Deno.mainModule.split(inConfig.Proxy);
return new Response(
`<!doctype html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
<meta charset="utf-8"/>
</head>
<body>
<div id="app"></div>
<script type="importmap">${JSON.stringify(inMap)}</script>
<script type="module">
import Mount from "${inConfig.Spoof}/boot-browser.tsx";
Mount("#app", "${parts[1]??"/app.tsx"}");
</script>
</body>
</html>`, {status:200, headers:{"content-type":"text/html"}});
},
SWCOp:
{
env:{
dynamicImport:false
},
sourceMaps: false,
minify: true,
jsc:
{
target:"es2022",
minify:
{
compress: { unused: true },
mangle: true
},
parser:
{
syntax: "typescript",
tsx: true,
},
transform:
{
react: { runtime: "automatic" }
}
}
}
};
export const Transpile =
{
Cache: new Map() as Map<string, string>,
Files: ["tsx", "jsx", "ts", "js", "mjs"],
Check(inExtension:string|false)
{
return inExtension ? this.Files.includes(inExtension) : false;
},
Clear()
{
const size = this.Cache.size;
this.Cache.clear();
ImportMapReload();
return size;
},
/**
* Converts dynamic module imports in to static, also can resolve paths with an import map
*/
async Patch(inPath:string, inKey:string, inMap?:DenoConfig)
{
const file = await fetch(inPath);
const text = await file.text();
const check = this.Cache.get(inKey);
if(check)
{
return check;
}
const remap = inMap ? (inPath:string)=>
{
const match = inMap.imports[inPath];
if(match)
{
return match;
}
else if(inPath.includes("/"))
{
let bestKey = "";
let bestLength = 0;
Object.keys(inMap.imports).forEach((key, i, arr)=>
{
if(key.endsWith("/") && inPath.startsWith(key) && key.length > bestLength)
{
bestKey = key;
bestLength = bestLength;
}
});
if(bestKey)
{
return inMap.imports[bestKey]+inPath.substring(bestKey.length);
}
}
return inPath;
}
: (inPath:string)=>inPath;
let match, regex;
let convertedBody = text;
// remap static imports
regex = /from\s+(['"`])(.*?)\1/g;
while ((match = regex.exec(text)))
{
const importStatement = match[0];
const importPath = match[2];
convertedBody = convertedBody.replace(importStatement, `from "${remap(importPath)}"`);
}
// convert dynamic imports into static (to work around deno deploy)
const staticImports = [];
regex = /(?<![\w.])import\(([^)]+)(?!import\b)\)/g;
while ((match = regex.exec(text)))
{
const importStatement = match[0];
const importPath = remap(match[1].substring(1, match[1].length-1));
const moduleName:string = `_dyn_${staticImports.length}`;
staticImports.push(`import ${moduleName} from ${importPath};`);
convertedBody = convertedBody.replace(importStatement, `Promise.resolve(${moduleName})`);
}
convertedBody = staticImports.join("\n") + convertedBody;
inKey && this.Cache.set(inKey, convertedBody);
return convertedBody;
},
async Fetch(inPath:string, inKey:string, inCheckCache=true)
{
const check = this.Cache.get(inPath);
if(check && inCheckCache)
{
return check;
}
else
{
try
{
const resp = await fetch(inPath);
const text = await resp.text();
const {code} = await SWCW.transform(text, { ...Configuration.SWCOp, filename:inKey});
this.Cache.set(inKey, code);
return code;
}
catch(e)
{
console.log(`Transpile.Fetch error. Key:"${inKey}" Path:"${inPath}" Error:"${e}"`);
return null;
}
}
}
};
export const Extension =(inPath:string)=>
{
const posSlash = inPath.lastIndexOf("/");
const posDot = inPath.lastIndexOf(".");
return posDot > posSlash ? inPath.substring(posDot+1).toLowerCase() : false;
};
export const Configure =(config:ConfigurationArgs)=>
{
Configuration = {...Configuration, ...config};
ImportMapReload();
}
await ImportMapReload();
await SWCW.default();
HTTP.serve(async(req: Request)=>
{
const url:URL = new URL(req.url);
const ext = Extension(url.pathname);
const headers = {"content-type":"application/json", "Access-Control-Allow-Origin": Configuration.Allow, "charset":"UTF-8"};
// cache-reset route
if(url.pathname === Configuration.Reset)
{
return new Response(`{"cleared":${Transpile.Clear()}}`, {headers});
}
// allow for custom handler
const custom = await Configuration.Serve(req, url, ext, ImportMap, Configuration);
if(custom)
{
return custom;
}
// transpileable files
if(Transpile.Check(ext))
{
let code;
let path;
if(url.pathname.startsWith(Configuration.Spoof+"/"))
{
const clipRoot = import.meta.url.substring(0, import.meta.url.lastIndexOf("/"));
const clipPath = url.pathname.substring(url.pathname.indexOf("/", 1));
if(clipPath.startsWith("/boot-"))
{
path = clipRoot+"/boot-browser.tsx";
}
else
{
path = clipRoot + clipPath;
}
code = await Transpile.Fetch(path, url.pathname, true);
}
else
{
path = Configuration.Proxy + url.pathname;
code = await Transpile.Fetch(path, url.pathname);
}
if(code)
{
return new Response(code, {headers:{...headers, "content-type":"application/javascript"}} );
}
}
// custom page html
if(!ext)
{
const shell = await Configuration.Shell(req, url, ext, ImportMap, Configuration);
if(shell)
{
return shell;
}
}
// all other static files
if(ext)
{
try
{
const type = MIME.typeByExtension(ext);
const file = await fetch(Configuration.Proxy + url.pathname);
const text = await file.text();
return new Response(text, {headers:{...headers, "content-type":type||""}});
}
catch(e)
{
return new Response(`{"error":"${e}", "path":"${url.pathname}"}`, {status:404, headers});
}
}
return new Response(`{"error":"unmatched route", "path":"${url.pathname}"}`, {status:404, headers});
});