Fix not to decode as JSON the empty response body (#1013)

## Changes

This PR fixes the issue where JSON deserialization occurs even when the
response body is empty.

## References
- #998

Author: habara-k

generator/src/main/resources/line-bot-sdk-nodejs-generator/apiBody/multipart.pebble

@@ -14,4 +14,6 @@
 {% endfor %},
             form,
         );
-        return {httpResponse: res, body: await res.json()};
+        const text = await res.text();
+        const parsedBody = text ? JSON.parse(text) : null;
+        return { httpResponse: res, body: parsedBody };

generator/src/main/resources/line-bot-sdk-nodejs-generator/apiBody/normal.pebble

@@ -48,5 +48,7 @@
             {% elseif op.hasQueryParams %}queryParams,{% endif %}
             {% if op.hasHeaderParams %}{headers: headerParams},{% endif %}
         );
-        return {httpResponse: res, body: await res.json()};
+        const text = await res.text();
+        const parsedBody = text ? JSON.parse(text) : null;
+        return { httpResponse: res, body: parsedBody };
 {% endif %}

lib/channel-access-token/api/channelAccessTokenClient.ts

@@ -104,7 +104,9 @@ export class ChannelAccessTokenClient {
       "/oauth2/v2.1/tokens/kid",
       queryParams,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Issue short-lived channel access token
@@ -157,7 +159,9 @@ export class ChannelAccessTokenClient {
       "/v2/oauth/accessToken",
       formParams,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Issues a channel access token that allows you to specify a desired expiration date. This method lets you use JWT assertion for authentication.
@@ -210,7 +214,9 @@ export class ChannelAccessTokenClient {
       "/oauth2/v2.1/token",
       formParams,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Issues a new stateless channel access token, which doesn\'t have max active token limit unlike the other token types. The newly issued token is only valid for 15 minutes but can not be revoked until it naturally expires.
@@ -272,7 +278,9 @@ export class ChannelAccessTokenClient {
     });
 
     const res = await this.httpClient.postForm("/oauth2/v3/token", formParams);
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Revoke short-lived or long-lived channel access token
@@ -306,7 +314,9 @@ export class ChannelAccessTokenClient {
     });
 
     const res = await this.httpClient.postForm("/v2/oauth/revoke", formParams);
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Revoke channel access token v2.1
@@ -359,7 +369,9 @@ export class ChannelAccessTokenClient {
       "/oauth2/v2.1/revoke",
       formParams,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Verify the validity of short-lived and long-lived channel access tokens
@@ -393,7 +405,9 @@ export class ChannelAccessTokenClient {
     });
 
     const res = await this.httpClient.postForm("/v2/oauth/verify", formParams);
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * You can verify whether a Channel access token with a user-specified expiration (Channel Access Token v2.1) is valid.
@@ -427,6 +441,8 @@ export class ChannelAccessTokenClient {
     });
 
     const res = await this.httpClient.get("/oauth2/v2.1/verify", queryParams);
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
 }

lib/insight/api/insightClient.ts

@@ -80,7 +80,9 @@ export class InsightClient {
     Types.ApiResponseType<GetFriendsDemographicsResponse>
   > {
     const res = await this.httpClient.get("/v2/bot/insight/demographic");
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Returns statistics about how users interact with narrowcast messages or broadcast messages sent from your LINE Official Account.
@@ -119,7 +121,9 @@ export class InsightClient {
       "/v2/bot/insight/message/event",
       queryParams,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Returns the number of users who have added the LINE Official Account on or before a specified date.
@@ -158,7 +162,9 @@ export class InsightClient {
       "/v2/bot/insight/followers",
       queryParams,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Returns the number of messages sent from LINE Official Account on a specified day.
@@ -197,7 +203,9 @@ export class InsightClient {
       "/v2/bot/insight/message/delivery",
       queryParams,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * You can check the per-unit statistics of how users interact with push messages and multicast messages sent from your LINE Official Account.
@@ -250,6 +258,8 @@ export class InsightClient {
       "/v2/bot/insight/message/event/aggregation",
       queryParams,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
 }

lib/liff/api/liffClient.ts

@@ -87,7 +87,9 @@ export class LiffClient {
     const params = addLiffAppRequest;
 
     const res = await this.httpClient.post("/liff/v1/apps", params);
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Deletes a LIFF app from a channel.
@@ -116,7 +118,9 @@ export class LiffClient {
     const res = await this.httpClient.delete(
       "/liff/v1/apps/{liffId}".replace("{liffId}", String(liffId)),
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Gets information on all the LIFF apps added to the channel.
@@ -139,7 +143,9 @@ export class LiffClient {
     Types.ApiResponseType<GetAllLiffAppsResponse>
   > {
     const res = await this.httpClient.get("/liff/v1/apps");
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Update LIFF app settings
@@ -176,6 +182,8 @@ export class LiffClient {
       "/liff/v1/apps/{liffId}".replace("{liffId}", String(liffId)),
       params,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
 }

lib/manage-audience/api/manageAudienceBlobClient.ts

@@ -102,7 +102,9 @@ export class ManageAudienceBlobClient {
       "/v2/bot/audienceGroup/upload/byFile",
       form,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Create audience for uploading user IDs (by file).
@@ -155,6 +157,8 @@ export class ManageAudienceBlobClient {
       "/v2/bot/audienceGroup/upload/byFile",
       form,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
 }

lib/manage-audience/api/manageAudienceClient.ts

@@ -99,7 +99,9 @@ export class ManageAudienceClient {
         String(audienceGroupId),
       ),
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Add user IDs or Identifiers for Advertisers (IFAs) to an audience for uploading user IDs (by JSON)
@@ -133,7 +135,9 @@ export class ManageAudienceClient {
       "/v2/bot/audienceGroup/upload",
       params,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Create audience for uploading user IDs (by JSON)
@@ -165,7 +169,9 @@ export class ManageAudienceClient {
       "/v2/bot/audienceGroup/upload",
       params,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Create audience for click-based retargeting
@@ -199,7 +205,9 @@ export class ManageAudienceClient {
       "/v2/bot/audienceGroup/click",
       params,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Create audience for impression-based retargeting
@@ -230,7 +238,9 @@ export class ManageAudienceClient {
     const params = createImpBasedAudienceGroupRequest;
 
     const res = await this.httpClient.post("/v2/bot/audienceGroup/imp", params);
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Delete audience
@@ -260,7 +270,9 @@ export class ManageAudienceClient {
         String(audienceGroupId),
       ),
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Gets audience data.
@@ -290,7 +302,9 @@ export class ManageAudienceClient {
         String(audienceGroupId),
       ),
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Get the authority level of the audience
@@ -313,7 +327,9 @@ export class ManageAudienceClient {
     const res = await this.httpClient.get(
       "/v2/bot/audienceGroup/authorityLevel",
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Gets data for more than one audience.
@@ -384,7 +400,9 @@ export class ManageAudienceClient {
       "/v2/bot/audienceGroup/list",
       queryParams,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Change the authority level of the audience
@@ -418,7 +436,9 @@ export class ManageAudienceClient {
       "/v2/bot/audienceGroup/authorityLevel",
       params,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Renames an existing audience.
@@ -460,6 +480,8 @@ export class ManageAudienceClient {
       ),
       params,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
 }

lib/messaging-api/api/messagingApiBlobClient.ts

@@ -149,7 +149,9 @@ export class MessagingApiBlobClient {
         String(messageId),
       ),
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
   /**
    * Download rich menu image.
@@ -217,6 +219,8 @@ export class MessagingApiBlobClient {
       ),
       params,
     );
-    return { httpResponse: res, body: await res.json() };
+    const text = await res.text();
+    const parsedBody = text ? JSON.parse(text) : null;
+    return { httpResponse: res, body: parsedBody };
   }
 }