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#!/usr/local/bin/python
import jinja2
import os
import sys
import subprocess
import glob
import codecs
# Utility functions
def log(txt):
print(txt, file=sys.stderr)
def error(txt):
log(txt)
sys.exit(2)
def convert(src, dst, environ):
"""Generate a file from a template
Args:
src (str): path to input file
dst (str): path to file to write
environ (dict): environment dictionary, for replacement mappings.
"""
with open(src) as infile:
template = infile.read()
rendered = jinja2.Template(template).render(**environ)
with open(dst, "w") as outfile:
outfile.write(rendered)
def generate_config_from_template(environ, ownership):
"""Generate a homeserver.yaml from environment variables
Args:
environ (dict): environment dictionary
ownership (str): "<user>:<group>" string which will be used to set
ownership of the generated configs
Returns:
path to generated config file
"""
for v in ("SYNAPSE_SERVER_NAME", "SYNAPSE_REPORT_STATS"):
if v not in environ:
error(
"Environment variable '%s' is mandatory when generating a config "
"file on-the-fly." % (v,)
)
# populate some params from data files (if they exist, else create new ones)
environ = environ.copy()
secrets = {
"registration": "SYNAPSE_REGISTRATION_SHARED_SECRET",
"macaroon": "SYNAPSE_MACAROON_SECRET_KEY",
}
for name, secret in secrets.items():
if secret not in environ:
filename = "/data/%s.%s.key" % (environ["SYNAPSE_SERVER_NAME"], name)
# if the file already exists, load in the existing value; otherwise,
# generate a new secret and write it to a file
if os.path.exists(filename):
with open(filename) as handle:
value = handle.read()
else:
log("Generating a random secret for {}".format(name))
value = codecs.encode(os.urandom(32), "hex").decode()
with open(filename, "w") as handle:
handle.write(value)
environ[secret] = value
environ["SYNAPSE_APPSERVICES"] = glob.glob("/data/appservices/*.yaml")
if not os.path.exists("/compiled"):
os.mkdir("/compiled")
config_path = "/compiled/homeserver.yaml"
# Convert SYNAPSE_NO_TLS to boolean if exists
if "SYNAPSE_NO_TLS" in environ:
tlsanswerstring = str.lower(environ["SYNAPSE_NO_TLS"])
if tlsanswerstring in ("true", "on", "1", "yes"):
environ["SYNAPSE_NO_TLS"] = True
else:
if tlsanswerstring in ("false", "off", "0", "no"):
environ["SYNAPSE_NO_TLS"] = False
else:
error(
'Environment variable "SYNAPSE_NO_TLS" found but value "'
+ tlsanswerstring
+ '" unrecognized; exiting.'
)
convert("/conf/homeserver.yaml", config_path, environ)
convert("/conf/log.config", "/compiled/log.config", environ)
subprocess.check_output(["chown", "-R", ownership, "/data"])
return config_path
def run_generate_config(environ):
"""Run synapse with a --generate-config param to generate a template config file
Args:
environ (dict): environment dictionary
Never returns.
"""
for v in ("SYNAPSE_SERVER_NAME", "SYNAPSE_REPORT_STATS", "SYNAPSE_CONFIG_PATH"):
if v not in environ:
error("Environment variable '%s' is mandatory in `generate` mode." % (v,))
args = [
"python",
"-m",
"synapse.app.homeserver",
"--server-name",
environ["SYNAPSE_SERVER_NAME"],
"--report-stats",
environ["SYNAPSE_REPORT_STATS"],
"--config-path",
environ["SYNAPSE_CONFIG_PATH"],
"--generate-config",
]
os.execv("/usr/local/bin/python", args)
def main(args, environ):
mode = args[1] if len(args) > 1 else None
ownership = "{}:{}".format(environ.get("UID", 991), environ.get("GID", 991))
# In generate mode, generate a configuration, missing keys, then exit
if mode == "generate":
return run_generate_config(environ)
# In normal mode, generate missing keys if any, then run synapse
if "SYNAPSE_CONFIG_PATH" in environ:
config_path = environ["SYNAPSE_CONFIG_PATH"]
else:
config_path = generate_config_from_template(environ, ownership)
args = [
"python",
"-m",
"synapse.app.homeserver",
"--config-path",
config_path,
# tell synapse to put any generated keys in /data rather than /compiled
"--keys-directory",
"/data",
]
# Generate missing keys and start synapse
subprocess.check_output(args + ["--generate-keys"])
os.execv("/sbin/su-exec", ["su-exec", ownership] + args)
if __name__ == "__main__":
main(sys.argv, os.environ)
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