fix(router): handle JSON connector response parse error (#1892)

crates/router/src/connector/braintree.rs

@@ -2,7 +2,7 @@ pub mod transformers;
 
 use std::fmt::Debug;
 
-use error_stack::{IntoReport, ResultExt};
+use error_stack::{IntoReport, Report, ResultExt};
 use masking::PeekInterface;
 
 use self::transformers as braintree;
@@ -10,7 +10,7 @@ use crate::{
     configs::settings,
     consts,
     core::errors::{self, CustomResult},
-    headers,
+    headers, logger,
     services::{
         self,
         request::{self, Mask},
@@ -46,6 +46,27 @@ impl ConnectorCommon for Braintree {
             auth.auth_header.into_masked(),
         )])
     }
+
+    fn build_error_response(
+        &self,
+        res: types::Response,
+    ) -> CustomResult<types::ErrorResponse, errors::ConnectorError> {
+        let response: Result<braintree::ErrorResponse, Report<common_utils::errors::ParsingError>> =
+            res.response.parse_struct("Braintree Error Response");
+
+        match response {
+            Ok(response_data) => Ok(types::ErrorResponse {
+                status_code: res.status_code,
+                code: consts::NO_ERROR_CODE.to_string(),
+                message: response_data.api_error_response.message,
+                reason: None,
+            }),
+            Err(error_msg) => {
+                logger::error!(deserialization_error =? error_msg);
+                utils::handle_json_response_deserialization_failure(res, "braintree".to_owned())
+            }
+        }
+    }
 }
 
 impl api::Payment for Braintree {}
@@ -140,17 +161,7 @@ impl
         &self,
         res: types::Response,
     ) -> CustomResult<types::ErrorResponse, errors::ConnectorError> {
-        let response: braintree::ErrorResponse = res
+        self.build_error_response(res)
-            .response
-            .parse_struct("Error Response")
-            .change_context(errors::ConnectorError::ResponseDeserializationFailed)?;
-
-        Ok(types::ErrorResponse {
-            status_code: res.status_code,
-            code: consts::NO_ERROR_CODE.to_string(),
-            message: response.api_error_response.message,
-            reason: None,
-        })
     }
 
     fn get_request_body(
@@ -291,17 +302,7 @@ impl
         &self,
         res: types::Response,
     ) -> CustomResult<types::ErrorResponse, errors::ConnectorError> {
-        let response: braintree::ErrorResponse = res
+        self.build_error_response(res)
-            .response
-            .parse_struct("Braintree Error Response")
-            .change_context(errors::ConnectorError::ResponseDeserializationFailed)?;
-
-        Ok(types::ErrorResponse {
-            status_code: res.status_code,
-            code: consts::NO_ERROR_CODE.to_string(),
-            message: response.api_error_response.message,
-            reason: None,
-        })
     }
 
     fn get_request_body(
@@ -429,16 +430,7 @@ impl
         &self,
         res: types::Response,
     ) -> CustomResult<types::ErrorResponse, errors::ConnectorError> {
-        let response: braintree::ErrorResponse = res
+        self.build_error_response(res)
-            .response
-            .parse_struct("Braintree ErrorResponse")
-            .change_context(errors::ConnectorError::ResponseDeserializationFailed)?;
-        Ok(types::ErrorResponse {
-            status_code: res.status_code,
-            code: consts::NO_ERROR_CODE.to_string(),
-            message: response.api_error_response.message,
-            reason: None,
-        })
     }
 }
 
@@ -511,17 +503,7 @@ impl
         &self,
         res: types::Response,
     ) -> CustomResult<types::ErrorResponse, errors::ConnectorError> {
-        let response: braintree::ErrorResponse = res
+        self.build_error_response(res)
-            .response
-            .parse_struct("Braintree ErrorResponse")
-            .change_context(errors::ConnectorError::ResponseDeserializationFailed)?;
-
-        Ok(types::ErrorResponse {
-            status_code: res.status_code,
-            code: consts::NO_ERROR_CODE.to_string(),
-            message: response.api_error_response.message,
-            reason: None,
-        })
     }
 
     fn get_request_body(

crates/router/src/connector/rapyd.rs

@@ -3,7 +3,7 @@ use std::fmt::Debug;
 
 use base64::Engine;
 use common_utils::{date_time, ext_traits::StringExt};
-use error_stack::{IntoReport, ResultExt};
+use error_stack::{IntoReport, Report, ResultExt};
 use masking::{ExposeInterface, PeekInterface};
 use rand::distributions::{Alphanumeric, DistString};
 use ring::hmac;
@@ -15,7 +15,7 @@ use crate::{
     consts,
     core::errors::{self, CustomResult},
     db::StorageInterface,
-    headers,
+    headers, logger,
     services::{
         self,
         request::{self, Mask},
@@ -82,16 +82,23 @@ impl ConnectorCommon for Rapyd {
         &self,
         res: types::Response,
     ) -> CustomResult<ErrorResponse, errors::ConnectorError> {
-        let response: rapyd::RapydPaymentsResponse = res
+        let response: Result<
-            .response
+            rapyd::RapydPaymentsResponse,
-            .parse_struct("Rapyd ErrorResponse")
+            Report<common_utils::errors::ParsingError>,
-            .change_context(errors::ConnectorError::ResponseDeserializationFailed)?;
+        > = res.response.parse_struct("Rapyd ErrorResponse");
-        Ok(ErrorResponse {
+
+        match response {
+            Ok(response_data) => Ok(ErrorResponse {
                 status_code: res.status_code,
-            code: response.status.error_code,
+                code: response_data.status.error_code,
-            message: response.status.status.unwrap_or_default(),
+                message: response_data.status.status.unwrap_or_default(),
-            reason: response.status.message,
+                reason: response_data.status.message,
-        })
+            }),
+            Err(error_msg) => {
+                logger::error!(deserialization_error =? error_msg);
+                utils::handle_json_response_deserialization_failure(res, "rapyd".to_owned())
+            }
+        }
     }
 }
 

crates/router/src/connector/trustpay.rs

@@ -4,7 +4,7 @@ use std::fmt::Debug;
 
 use base64::Engine;
 use common_utils::{crypto, errors::ReportSwitchExt, ext_traits::ByteSliceExt};
-use error_stack::{IntoReport, ResultExt};
+use error_stack::{IntoReport, Report, ResultExt};
 use masking::PeekInterface;
 use transformers as trustpay;
 
@@ -19,7 +19,7 @@ use crate::{
         errors::{self, CustomResult},
         payments,
     },
-    headers,
+    headers, logger,
     services::{
         self,
         request::{self, Mask},
@@ -104,16 +104,19 @@ impl ConnectorCommon for Trustpay {
         &self,
         res: Response,
     ) -> CustomResult<ErrorResponse, errors::ConnectorError> {
-        let response: trustpay::TrustpayErrorResponse = res
+        let response: Result<
-            .response
+            trustpay::TrustpayErrorResponse,
-            .parse_struct("trustpay ErrorResponse")
+            Report<common_utils::errors::ParsingError>,
-            .change_context(errors::ConnectorError::ResponseDeserializationFailed)?;
+        > = res.response.parse_struct("trustpay ErrorResponse");
-        let error_list = response.errors.clone().unwrap_or(vec![]);
+
+        match response {
+            Ok(response_data) => {
+                let error_list = response_data.errors.clone().unwrap_or(vec![]);
                 let option_error_code_message = get_error_code_error_message_based_on_priority(
                     self.clone(),
                     error_list.into_iter().map(|errors| errors.into()).collect(),
                 );
-        let reason = response.errors.map(|errors| {
+                let reason = response_data.errors.map(|errors| {
                     errors
                         .iter()
                         .map(|error| error.description.clone())
@@ -130,9 +133,15 @@ impl ConnectorCommon for Trustpay {
                     message: option_error_code_message
                         .map(|error_code_message| error_code_message.error_code)
                         .unwrap_or(consts::NO_ERROR_MESSAGE.to_string()),
-            reason: reason.or(response.description),
+                    reason: reason.or(response_data.description),
                 })
             }
+            Err(error_msg) => {
+                logger::error!(deserialization_error =? error_msg);
+                utils::handle_json_response_deserialization_failure(res, "trustpay".to_owned())
+            }
+        }
+    }
 }
 
 impl api::Payment for Trustpay {}

crates/router/src/utils.rs

@@ -17,13 +17,16 @@ use image::Luma;
 use nanoid::nanoid;
 use qrcode;
 use serde::de::DeserializeOwned;
+use serde_json::Value;
 use uuid::Uuid;
 
 pub use self::ext_traits::{OptionExt, ValidateCall};
 use crate::{
     consts,
-    core::errors::{self, RouterResult},
+    core::errors::{self, CustomResult, RouterResult},
-    logger, types,
+    logger,
+    routes::metrics,
+    types,
 };
 
 pub mod error_parser {
@@ -176,3 +179,36 @@ mod tests {
         assert!(qr_image_data_source_url.is_ok());
     }
 }
+
+// validate json format for the error
+pub fn handle_json_response_deserialization_failure(
+    res: types::Response,
+    connector: String,
+) -> CustomResult<types::ErrorResponse, errors::ConnectorError> {
+    metrics::RESPONSE_DESERIALIZATION_FAILURE.add(
+        &metrics::CONTEXT,
+        1,
+        &[metrics::request::add_attributes("connector", connector)],
+    );
+
+    let response_data = String::from_utf8(res.response.to_vec())
+        .into_report()
+        .change_context(errors::ConnectorError::ResponseDeserializationFailed)?;
+
+    // check for whether the response is in json format
+    match serde_json::from_str::<Value>(&response_data) {
+        // in case of unexpected response but in json format
+        Ok(_) => Err(errors::ConnectorError::ResponseDeserializationFailed)?,
+        // in case of unexpected response but in html or string format
+        Err(error_msg) => {
+            logger::error!(deserialization_error=?error_msg);
+            logger::error!("UNEXPECTED RESPONSE FROM CONNECTOR: {}", response_data);
+            Ok(types::ErrorResponse {
+                status_code: res.status_code,
+                code: consts::NO_ERROR_CODE.to_string(),
+                message: consts::UNSUPPORTED_ERROR_MESSAGE.to_string(),
+                reason: Some(response_data),
+            })
+        }
+    }
+}