Sudo-JHare/FHIRFLARE-IG-Toolkit
Sudo-JHare/FHIRFLARE-IG-Toolkit
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Update app.py

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Joshua Hare 2025-08-27 14:16:52 +10:00
parent d37af01b3a
commit 85f980be0a
1 changed files with 18 additions and 36 deletions
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40
app.py
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@ -1780,58 +1780,40 @@ def fhir_ui_operations():
# Use a single route to capture everything after /fhir/
# The 'path' converter handles slashes. 'subpath' can be empty.
@app.route('/fhir', defaults={'subpath': ''}, methods=['GET', 'POST', 'PUT', 'DELETE'])
@app.route('/fhir/', defaults={'subpath': ''}, methods=['GET', 'POST', 'PUT', 'DELETE'])
@app.route('/fhir/<path:subpath>', methods=['GET', 'POST', 'PUT', 'DELETE'])
@app.route('/fhir', defaults={'subpath': ''}, methods=['GET', 'POST', 'PUT', 'DELETE', 'PATCH'])
@app.route('/fhir/', defaults={'subpath': ''}, methods=['GET', 'POST', 'PUT', 'DELETE', 'PATCH'])
@app.route('/fhir/<path:subpath>', methods=['GET', 'POST', 'PUT', 'DELETE', 'PATCH'])
def proxy_hapi(subpath):
"""
Proxies FHIR requests to either the local HAPI server or a custom
target server specified by the 'X-Target-FHIR-Server' header.
Handles requests to /fhir/ (base, subpath='') and /fhir/<subpath>.
The route '/fhir' (no trailing slash) is handled separately for the UI.
target server specified by the 'X-Target-FHIR-Server' header or a query parameter.
"""
# Clean subpath just in case prefixes were somehow included
clean_subpath = subpath.replace('r4/', '', 1).replace('fhir/', '', 1).strip('/')
logger.debug(f"Proxy received request for path: '/fhir/{subpath}', cleaned subpath: '{clean_subpath}'")
logger.debug(f"Proxy received request for path: '/fhir/{subpath}'")
# Determine the target FHIR server base URL
# NEW: Check for proxy-target query parameter first
target_server_query = request.args.get('proxy-target')
target_server_header = request.headers.get('X-Target-FHIR-Server')
final_base_url = None
is_custom_target = False
if target_server_query:
try:
parsed_url = urlparse(target_server_query)
if not parsed_url.scheme or not parsed_url.netloc:
raise ValueError("Invalid URL format in proxy-target query parameter")
final_base_url = target_server_query.rstrip('/')
is_custom_target = True
logger.info(f"Proxy target identified from query parameter: {final_base_url}")
except ValueError as e:
logger.warning(f"Invalid URL in proxy-target query parameter: '{target_server_query}'. Falling back. Error: {e}")
final_base_url = current_app.config['HAPI_FHIR_URL'].rstrip('/')
logger.debug(f"Falling back to default local HAPI due to invalid query: {final_base_url}")
elif target_server_header:
try:
parsed_url = urlparse(target_server_header)
if not parsed_url.scheme or not parsed_url.netloc:
raise ValueError("Invalid URL format in X-Target-FHIR-Server header")
final_base_url = target_server_header.rstrip('/')
is_custom_target = True
logger.info(f"Proxy target identified from header: {final_base_url}")
except ValueError as e:
logger.warning(f"Invalid URL in X-Target-FHIR-Server header: '{target_server_header}'. Falling back. Error: {e}")
final_base_url = current_app.config['HAPI_FHIR_URL'].rstrip('/')
logger.debug(f"Falling back to default local HAPI due to invalid header: {final_base_url}")
else:
final_base_url = current_app.config['HAPI_FHIR_URL'].rstrip('/')
logger.debug(f"No target info found, proxying to default local HAPI: {final_base_url}")
# Construct the final URL for the target server request
# Append the cleaned subpath only if it's not empty
final_url = f"{final_base_url}/{clean_subpath}" if clean_subpath else final_base_url
# Construct the final URL for the target server request. This is the core logical change.
# The subpath variable now correctly captures the remaining part of the URL after '/fhir/'.
# We construct the final URL by joining the base URL and the subpath.
final_url = f"{final_base_url}/{subpath}" if subpath else final_base_url
logger.debug(f"Final URL for target server: {final_url}")
# Prepare headers to forward
headers_to_forward = {