Add a helper function to verify webhook requests

The new `request::verified()` takes POST params as a string as does all
the work needed to call `paddle::verify_signature()`.

This involves extracting the `p_signature` POST parameter to get the
signature, and getting the public key PEM.

Change `params::parse()` to return a
`BTreeMap<Cow<'a, str>, Cow<'a, str>>` instead of `String` keys &
values. This is because `paddle::verify_signature()` needs a `(<&str,
&str)` iterator. Actually, it still doesn't solve the problem because
the types don't match. We need to modify the input type of
`verify_signature()`, but at least this change gives us references.

Make `params` private to the crate because we no longer need to use it
in `main()`.

1 files changed, 3 insertions, 3 deletions

diff --git a/license-generator/src/main.rs b/license-generator/src/main.rs
index 43a9d77..2211d6e 100644
--- a/license-generator/src/main.rs
+++ b/license-generator/src/main.rs
@@ -15,8 +15,8 @@ use simplelog::{Config, LevelFilter, WriteLogger};
 
 use license_generator::database;
 use license_generator::errors::*;
-use license_generator::params;
 use license_generator::purchaser::Purchaser;
+use license_generator::request;
 
 fn main() -> Result<()> {
     let log_file_path = env::var("LOG_FILE")
@@ -63,8 +63,8 @@ fn main() -> Result<()> {
         write!(&mut req.stdout(), "\n\nstdin: {}\n", stdin)
             .unwrap_or(());
 
-        let p = params::parse(&stdin);
-        write!(&mut req.stdout(), "\n{:?}\n", p)
+        let is_verified = request::verified(&stdin);
+        write!(&mut req.stdout(), "\n{:?}\n", is_verified)
             .unwrap_or(());
     });