Google App Script funtions

getFileByName.gs

//https://yagisanatode.com/2018/10/05/google-apps-script-get-file-by-name-with-optional-parent-folder-crosscheck/
function getFileByName(fileName, fileInFolder){
 
  var filecount = 0;
  var dupFileArray = [];
  var folderID = "";
  
  var files = DriveApp.getFilesByName(fileName);
  
  while(files.hasNext()){
    var file = files.next();
    dupFileArray.push(file.getId());
    
    filecount++;
  };
  
  if(filecount > 1){
    if(typeof fileInFolder === 'undefined'){
        folderID = {"id":false,"error":"More than one file with name: "+fileName+". \nTry adding the file's folder name as a reference in Argument 2 of this function."}
    
    }else{
     //iterate through list of files with the same name
     for(fl = 0; fl < dupFileArray.length; fl++){
       var activeFile = DriveApp.getFileById(dupFileArray[fl]);
       var folders = activeFile.getParents();
       var folder = ""
       var foldercount = 0;
       
       //Get the folder name for each file
       while(folders.hasNext()){
         folder = folders.next().getName(); 
         foldercount++;
       };
       
       if(folder === fileInFolder && foldercount > 1){
         folderID = {"id":false,"error":"There is more than one parent folder: "+fileInFolder+" for file "+fileName}
       };
       
       if(folder === fileInFolder){
           folderID = {"id":dupFileArray[fl],"error":false};
           
       }else{
         folderID = {"id":false,"error":"There are multiple files named: "+fileName+". \nBut none of them are in folder, "+fileInFolder}
       };
     };
   };
   
  }else if(filecount === 0){
      folderID = {"id":false,"error":"No file in your drive exists with name: "+fileName};
      
  }else{ //IF there is only 1 file with fileName
    folderID = {"id":dupFileArray[0],"error":false};
    };
 
  return folderID;
};

wechat.gs

function wechat(wechat_bot_url, message_text){
  var subscribe = {
    "msgtype": "text",
    "text": {
      "content": message_text
      } 
    };

    var options = {
      "method": "post",
      "contentType": "application/json",
      "payload": JSON.stringify(subscribe)};
    var res = UrlFetchApp.fetch(wechat_bot_url, options);
    console.log(res);
}