Merge branch 'default-app-404' into 'v0.10.0'

Added a more friendly default 404 response for the nomad app. See merge request !277

Merge branch 'default-app-404' into 'v0.10.0'
Added a more friendly default 404 response for the nomad app. See merge request !277
d8984d35 · Markus Scheidgen · fd8e62d2 · bac3146d · d8984d35 · d8984d35
Commit d8984d35 authored Mar 12, 2021 by Markus Scheidgen
--- a/.gitignore
+++ b/.gitignore
@@ -34,3 +34,4 @@ parser.osio.log
 gui/src/metainfo.json
 gui/src/searchQuantities.json
 examples/workdir/
+*/node_modules/
--- a/nomad/app/main.py
+++ b/nomad/app/main.py
@@ -17,8 +17,11 @@
 #

 from fastapi import FastAPI, status, Response
+from fastapi.responses import JSONResponse, HTMLResponse
 from fastapi.middleware.wsgi import WSGIMiddleware
 from starlette.middleware.base import BaseHTTPMiddleware
+from starlette.exceptions import HTTPException as StarletteHTTPException
+from fastapi.exception_handlers import http_exception_handler as default_http_exception_handler

 from nomad import config, infrastructure

@@ -70,3 +73,57 @@ async def startup_event():
        pass

    infrastructure.setup()
+
+
+@app.exception_handler(StarletteHTTPException)
+async def http_exception_handler(request, exc):
+    if exc.status_code != 404:
+        return await default_http_exception_handler(request, exc)
+
+    try:
+        accept = request.headers['accept']
+    except Exception:
+        accept = None
+
+    if accept is not None and 'html' in accept:
+        return HTMLResponse(status_code=404, content=f'''
+        <html>
+            <head><title>{config.meta.name}</title></head>
+            <body>
+                <h1>NOMAD app</h1>
+                <h2>info</h2>
+                {'<br/>'.join(f'{key}: {value}' for key, value in config.meta.items())}
+                <h2>apis</h2>
+                <a href="{app_base}/api">NOMAD API v0</a><br/>
+                <a href="{app_base}/api/v1/extensions/docs">NOMAD API v1</a><br/>
+                <a href="{app_base}/optimade/v1/extensions/docs">Optimade API</a><br/>
+                <a href="{app_base}/dcat">DCAT API</a><br/>
+            </body>
+        </html>
+        ''')
+
+    return JSONResponse(status_code=404, content={
+        'detail': 'Not found',
+        'info': {
+            'app': config.meta,
+            'apis': {
+                'v0': {
+                    'root': f'{app_base}/api',
+                    'dashboard': f'{app_base}/api',
+                },
+                'v1': {
+                    'root': f'{app_base}/api/v1',
+                    'dashboard': f'{app_base}/api/v1/extensions/docs',
+                    'documentation': f'{app_base}/api/v1/extensions/redoc',
+                },
+                'optimade': {
+                    'root': f'{app_base}/optimade/v1',
+                    'dashboard': f'{app_base}/optimade/v1/extensions/docs'
+                },
+                'dcat': {
+                    'root': f'{app_base}/dcat',
+                    'dashboard': f'{app_base}/dcat'
+                }
+            }
+        }
+    })