Lunch commit

Add editbook. Add err_parameter to jsonfail. Update design.

design.txt

@@ -121,9 +121,14 @@
 		pubdate
 		status
 		
+		错误:
+		权限不足,添加失败
+	
 	http://booksys.com/api/v1/editbook POST
 		POST:
 		book_key (唯一图书定义序号)
+		
+		以下所有列均为可选: 当任一列存在时将引起数据的修改
 			isbn 
 			bookname
 			booktype
@@ -132,6 +137,9 @@
 			pubdate
 			status
 		
+		错误:
+		权限不足,修改失败
+	
 	http://booksys.com/api/v1/removebook POST
 		POST:
 		book_key (唯一图书定义序号)

editbook.cpp

@@ -0,0 +1,219 @@
+#include "Session.h"
+#include "Util.h"
+#include "json.hpp"
+#include "jsonfail.h"
+using namespace std;
+using json=nlohmann::json;
+
+#define postval(NAME) string NAME=req.post[#NAME]
+#define gpostval(NAME) NAME=new string;*NAME=req.post[#NAME]
+#define tpostval(NAME) string* NAME=nullptr; do { if(postexist(#NAME)) { gpostval(NAME); } }while(0)
+
+int main()
+{
+    Request req;
+    Session se(req);
+    Response res;
+    json j;
+
+    auto jsonfail=[&](int errcode,const string& detail="")
+    {
+        j["success"]=0;
+        j["errcode"]=errcode;
+        j["errmsg"]=string(GetErrMsg(errcode))+" : "+detail;
+    };
+
+    /// Used by Marco: tpostval(NAME)
+    auto postexist=[&](const string& key)->bool
+    {
+        return req.post.find(key)!=req.post.end();
+    };
+
+    do
+    {
+        if(!se.isReady())
+        {
+            jsonfail(err_session);
+            break;
+        }
+        if(se.isNew()||se.getUser().empty())
+        {
+            jsonfail(err_need_login);
+            break;
+        }
+
+        if(req.requestMethod!="POST")
+        {
+            jsonfail(err_method_not_supported);
+            break;
+        }
+
+        if(req.post["book_key"].empty())
+        {
+            jsonfail(err_missing_parameter);
+            break;
+        }
+
+        postval(book_key);
+        int book_key_real=ParseInt(book_key);
+        if(book_key_real<0)
+        {
+            jsonfail(err_parameter,"Book Key Parse Error");
+            break;
+        }
+
+        DBInfo db;
+        MySQLConn conn;
+        if(db.readConfig()<0)
+        {
+            jsonfail(err_config);
+            break;
+        }
+
+        if(db.connectProxy(conn)<0)
+        {
+            jsonfail(err_connect);
+            break;
+        }
+
+        /// Check Permission
+        int permission_level;
+        if(conn.exec(make_str("select permission_level from bs_user where username='",
+                              se.getUser(),
+                              "'"),
+                     [&](MySQLResult& res)
+                     {
+                         res.stepRow([&](char** val,unsigned long* len)
+                                     {
+                                         permission_level=ParseInt(val[0]);
+                                    });
+                    })<0)
+        {
+            jsonfail(err_sql,"Step 1");
+            break;
+        }
+
+        if(permission_level>1)
+        {
+            /// Permission Denied.
+            jsonfail(err_permission_denied);
+            break;
+        }
+
+        /// Try to verify book_key (class_id)
+        int count_class_id_val;
+        if(conn.exec(make_str("select count(class_id) from bs_book where class_id=",
+                              book_key_real),
+                     [&](MySQLResult& res)
+                     {
+                         res.stepRow([&](char** val,unsigned long* len)
+                                     {
+                                         count_class_id_val=ParseInt(val[0]);
+                                     });
+                     })<0)
+        {
+            jsonfail(err_sql,"Step 2");
+            break;
+        }
+
+        if(count_class_id_val!=1)
+        {
+            /// Failed to verify
+            jsonfail(err_data,"Cannot verify book key.");
+            break;
+        }
+
+        /// Try to fetch values.
+        tpostval(isbn);
+        tpostval(bookname);
+        tpostval(booktype);
+        tpostval(author);
+        tpostval(publisher);
+        tpostval(pubdate);
+        tpostval(status);
+
+        if(status!=nullptr)
+        {
+            int _in_status=ParseInt(*status);
+            if(_in_status<0)
+            {
+                jsonfail(err_parameter,"Status parse failed.");
+                break;
+            }
+
+            /// Verify status
+            int status_cnt;
+            if(conn.exec(make_str("select count(status) from bs_meta_book where status=",
+                                  _in_status),
+                         [&](MySQLResult& res)
+                         {
+                             res.stepRow([&](char** val,unsigned long* len)
+                                         {
+                                             status_cnt=ParseInt(val[0]);
+                                         });
+                         })<0)
+            {
+                jsonfail(err_sql,"Step 3");
+                break;
+            }
+
+            if(status_cnt!=1)
+            {
+                jsonfail(err_data,"Cannot verify status");
+                break;
+            }
+
+            if(conn.exec(make_str("update bs_book set status=",_in_status),nullptr)<0)
+            {
+                jsonfail(err_sql,"Step 4 status");
+                break;
+            }
+
+            if(conn.getAffectedRows()!=1)
+            {
+                jsonfail(err_sql_logic,"status");
+                break;
+            }
+        }
+
+        #define doUpdate(NAME,SETNAME) \
+            if(NAME!=nullptr) \
+            {\
+                if((*NAME).empty()) \
+                {\
+                    *NAME="null";\
+                }\
+                else\
+                {\
+                    *NAME=make_str("'",(*NAME),"'");\
+                }\
+                if(conn.exec(make_str("update bs_book set ",SETNAME,"=",\
+                                      *NAME,\
+                                      " where class_id=",\
+                                      book_key_real),nullptr)<0)\
+                {\
+                    jsonfail(err_sql,make_str("Step 4 ",SETNAME));\
+                    break;\
+                }\
+                if(conn.getAffectedRows()!=1)\
+                {\
+                    jsonfail(err_sql_logic,SETNAME);\
+                    break;\
+                }\
+            }
+
+        doUpdate(isbn,"isbn");
+        doUpdate(bookname,"name");
+        doUpdate(booktype,"book_type");
+        doUpdate(author,"author");
+        doUpdate(publisher,"publisher");
+        doUpdate(pubdate,"publish_time");
+
+        j["success"]=1;
+    }while(0);
+
+    res.content.append(j.dump());
+    res.show();
+
+    return 0;
+}

jsonfail.cpp

@@ -26,6 +26,8 @@ const char* GetErrMsg(int errcode)
         return "Session Error";
     case err_general:
         return "General error";
+    case err_parameter:
+        return "Parameter error";
     default:
         return "Unknown error";
     }

jsonfail.h

@@ -11,5 +11,6 @@
 #define err_data 9
 #define err_session 10
 #define err_general 11
+#define err_parameter 12
 
 const char* GetErrMsg(int errcode);