Add DENO_CERT environment variable for Deno TLS support (#97)

Deno uses DENO_CERT instead of standard SSL_CERT_FILE to specify
custom CA certificates. Without this, Deno programs fail with
certificate errors when running under httpjail.

Author: magurotuna

docs/advanced/tls-interception.md

@@ -21,6 +21,7 @@ httpjail sets these environment variables for the child process:
 - `CURL_CA_BUNDLE` - curl
 - `REQUESTS_CA_BUNDLE` - Python requests
 - `NODE_EXTRA_CA_CERTS` - Node.js
+- `DENO_CERT` - Deno
 - `CARGO_HTTP_CAINFO` - Cargo
 - `GIT_SSL_CAINFO` - Git
 

docs/guide/platform-support.md

@@ -138,5 +138,6 @@ httpjail sets these variables for the child process to trust the CA certificate:
 - `CURL_CA_BUNDLE` - curl
 - `REQUESTS_CA_BUNDLE` - Python requests
 - `NODE_EXTRA_CA_CERTS` - Node.js
+- `DENO_CERT` - Deno
 - `CARGO_HTTP_CAINFO` - Cargo
 - `GIT_SSL_CAINFO` - Git

src/tls.rs

@@ -365,7 +365,9 @@ impl CertificateManager {
             // Python requests
             ("REQUESTS_CA_BUNDLE".to_string(), ca_path_str.clone()),
             // Node.js
-            ("NODE_EXTRA_CA_CERTS".to_string(), ca_path_str),
+            ("NODE_EXTRA_CA_CERTS".to_string(), ca_path_str.clone()),
+            // Deno
+            ("DENO_CERT".to_string(), ca_path_str),
         ];
 
         Ok(env_vars)