I want to download in frontend an excel file that is coming from backend as OData. The file is encoded using FM 'SCMS_BASE64_ENCODE_STR' and now I want to decode it and download it using SAPUI5. I am trying the object sap.ui.core.util.File.save but I get a corrupted file. Here is a test code that I created with an excel file encoded using the following site online (https://base64.guru/converter/encode/file).
openFile: function(){
var data = 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sap.ui.core.util.File.save(data, 'test', 'xlsx', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', null, null);
},
Thanks to (https://www.geeksforgeeks.org/how-to-convert-base64-to-file-in-javascript/), I found this solution.
openFile: function(){
var base64String = 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const mimeType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
const base64Data = base64String.replace(/^data:.+;base64,/, '');
const byteCharacters = atob(base64Data); // Decode Base64 string
const byteNumbers = new Array(byteCharacters.length);
for (let i = 0; i < byteCharacters.length; i++) {
byteNumbers[i] = byteCharacters.charCodeAt(i);
}
const byteArray = new Uint8Array(byteNumbers);
const blob = new Blob([byteArray], { type: mimeType });
sap.ui.core.util.File.save(blob, 'test', 'xlsx', mimeType, null, null);
}