Add support for Json Web Token verification

Cargo.toml

@@ -7,6 +7,7 @@ members = [
     "crates/roc_host",
     "crates/roc_host_lib",
     "crates/roc_host_bin",
+    "crates/json_web_token",
 ]
 
 [profile.release]

ci/expect_scripts/json-web-token.exp

@@ -0,0 +1,19 @@
+#!/usr/bin/expect
+
+# uncomment line below for debugging
+# exp_internal 1
+
+set timeout 7
+
+set env(TARGET_URL) "http://www.example.com"
+
+spawn $env(EXAMPLES_DIR)json-web-token
+
+expect -exact "All tests passed\r\n" {
+        expect "Listening on <http://127.0.0.1:8000>\r\n" {
+        exit 0
+    }
+}
+
+puts stderr "\nError: output was different than expected."
+exit 1

crates/json_web_token/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "json_web_token"
+version = "0.0.1"
+authors = ["The Roc Contributors"]
+license = "UPL-1.0"
+edition = "2018"
+description = "Provides a simple interface for working with JWTs"
+
+[lib]
+crate-type = ["rlib"]
+name = "json_web_token"
+path = "src/lib.rs"
+
+[dependencies]
+indoc = "2"
+jwt = { version = "0.16.0", features = ["openssl"]}
+hmac = "0.12.1"
+sha2 = "0.10.8"
+serde_json = "1.0.127"
+openssl = {version = "0.10.66", features = ["vendored"]}