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Now that Bubble supports Titan I'm interested in trying it out on my capsule; however, the existing information on how to set it up server side isn't obvious to me. Anyone have some basic example on how to use Titan on your capsule? I'm using gmcapsule
2023-06-09 · 5 months ago · 👍 jsreed5, Addison
I'd be interested to learn more about this too. My capsule runs JetForce and does not support Titan natively.
yeah, I think just a basic "hello world" example implementation would be quite useful, say in like Python.
I can put together a GmCapsule Titan hello world example for you.
Are you primarily interested in the CGI interface, or doing a Python extension module? The latter is more flexible/powerful since you're using Python, but the CGI one is pretty standard and easy, done via environment variables and stdin.
2023-06-10 · 5 months ago
These examples assume gmcapsuled running on localhost.
Here is a simple CGI Python script that we'll use:
#!/usr/bin/python3
import os
import sys
titan_data = sys.stdin.read()
print("20 text/gemini\r")
print("Client cert hashes:", os.getenv('REMOTE_IDENT'))
print("Titan token:", os.getenv('TITAN_TOKEN'))
print("You uploaded %d bytes." % len(titan_data))
Place the above script file anywhere you'd like, say "scripts/hello.py", and add this to the server config:
[cgi.hello] protocol = titan path = /hello-world command = /usr/bin/python3 scripts/hello.py
(paths are relative to where you start gmcapsuled)
Then open "titan://localhost/hello-world" in the client to start an upload.
The advantage of setting the `bin_root` is that you can add and remove scripts in your CGI directory without restarting the server.
Normally executables inside the bin_root are assumed to be Gemini CGI scripts. To make them use Titan, append ",titan" to the executable name. So, let's create a bin_root directory called "./cgi-bin", and your script should be named:
./cgi-bin/localhost/hello-world,titan
Don't forget to set the file as executable.
The bin_root is configured in the server config:
[cgi] bin_root = ./cgi-bin
You can then open "titan://localhost/hello-world" in the client to start an upload.
Methods 1 and 2 are mutually exclusive, you can choose which one works best for you.
It's actually quite simple to create a simple Titan upload handler via a Python extension module. Add a custom modules directory in the server config:
[server] modules = ./mymod
Create this Python source file as "./mymod/50_hello.py":
def titan_upload_handler(req):
response = 'Client cert hash: ' + req.identity.fp_cert
response += '\nYou uploaded %d bytes.\n' % len(req.content)
return response
def init(capsule):
"""Extension module initialization."""
capsule.add('/titan-hello',
titan_upload_handler,
protocol='titan')
Open "titan://localhost/titan-hello" to start the upload.
@skyjake thank you! exactly what I was looking for, appreciate the detailed response. I was also wondering about extensions so that helps as well
No problem! I've been planning to write documentation like this and make it available on my capsule.
One more thing to note: the current version of GmCapsule requires that Titan uploads use a client certificate, i.e., no anonymous uploads are allowed. I need to add a config parameter for this.
@skyjake ah yes, I was wondering about the client cert prompts, makes sense now