Move lib to root dir

src/client.rs

@@ -0,0 +1,64 @@
+use serde::{Deserialize, Serialize};
+
+use crate::error::SfAuthError;
+
+const VALIDATION_URL: &str = "https://snazzyfellas.com/api/redirect/validate";
+
+/// Request payload for validation API
+#[derive(Debug, Serialize)]
+struct ValidationRequest {
+    user_id: String,
+    key: String,
+}
+
+/// Response from validation API
+#[derive(Debug, Deserialize)]
+struct ValidationResponse {
+    valid: bool,
+    user_id: String,
+}
+
+/// Validates user credentials with the SF authentication server.
+///
+/// Makes a POST request to the validation endpoint with the user_id and key.
+/// Returns `Ok(user_id)` if validation succeeds, or an error otherwise.
+///
+/// # Arguments
+///
+/// * `user_id` - The user ID to validate
+/// * `key` - The authentication key to validate
+///
+/// # Errors
+///
+/// Returns an error if:
+/// - The HTTP request fails
+/// - The validation response indicates invalid credentials
+/// - The returned user_id doesn't match the requested user_id
+pub(crate) async fn validate_user(user_id: String, key: String) -> Result<String, SfAuthError> {
+    let client = reqwest::Client::new();
+
+    let request_payload = ValidationRequest {
+        user_id: user_id.clone(),
+        key,
+    };
+
+    let response = client
+        .post(VALIDATION_URL)
+        .json(&request_payload)
+        .send()
+        .await?;
+
+    let validation_response: ValidationResponse = response.json().await?;
+
+    // Check if validation succeeded
+    if !validation_response.valid {
+        return Err(SfAuthError::ValidationFailed);
+    }
+
+    // Verify that the returned user_id matches what we sent
+    if validation_response.user_id != user_id {
+        return Err(SfAuthError::UserIdMismatch);
+    }
+
+    Ok(validation_response.user_id)
+}