網上的Base64解碼器

I wondering how to resolve below problem. If I gotted string with parameters as a raw string spring resolve parameters as a Map, but if I hashed string by Base64, spring has a problem with that. So the question is, if is clean way to manage this situation? Maybe is something which is OOTB?

I have two:

• Decoded hashed string, and add logic to parse string, but it was
  quite complicated because value can be more parameters.
• Change string on JSON format and add the simplest logic to decodeparameters to map.

For now string looking: "key1=value1&k2=1540277853602&k3={"k4":3,"k5":76,"k7":342,"k8":374}&k9=3f067..."

I was looking into my Mail Server in Text version; There is saw an attachment of filename= xyz.xslx & Content-Transfer-Encoding: base-64 and after that there was stream of Base64 encoded Code. Initially the content-type was Content-Type: application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;

Now, Is it possible to convert the base-64 encoded string code to retrieve the xslx document? I tried using several online sites like base64decode.org but as the initial file type was xslx, it didn't gave any output in Plain-Text too. So how do i work out with issue ?

On October 16, at about 8 PM CDT, YouTube went down. Visitors of the site were presented with the following "Internal Server Error" page:

This page presented the user with some information (the full text from this screenshot is here) that they could give to the YouTube support team, which is encoded in some form.

It appears to have 64 different possible characters [a-zA-Z0-9\-_], which seems to suggest that it could be a modified form of base64. However, when I tried replacing - with + and _ with / as well as the other way around, I was unable to produce any meaningful data.^{1, 2}

Can anyone tell what form of binary-to-text encoding this is?

^{2. I tried using file to detect the file type. There are definitely other ways that I'm not aware of.}

I wonder if someone know how to convert the depth map of google street view (encoded as base64) into an image or a 2D matrix. I'm using Python and was able to get the base64 string, decode it and save it to a .png file. However, the exported png file cannot be open by any graphic viewer... I guess the base64 code wasn't decoded correctly...

Here is a post that mentioned the base64 string in GSV.

Here is my code:

#URL of the json file of a GSV depth mapurl_depthmap='http://maps.google.com/cbk?output=json&cb_client=maps_sv&v=4&dm=1&pm=1&ph=1&hl=en&panoid=lcptgwtxfJ6DccSzyWp0zA'# getting the json filer = requests.get(url_depthmap)# open itdepth_json= r.json()# get the base64 string of the depth mapdata=depth_json['model']['depth_map']# fix the 'inccorrect padding' error. The length of the string needs to be divisible by 4.data += "=" * ((4 - len(data) % 4) % 4)# convert the URL safe format to regular format.data=data.replace('-','+').replace('_','/')data = base64.decodestring(data) # decode the stringdata=zlib.decompress(data) #decompress the data# write it to a png fileimage_result = open('downloads/deer_decode.png', 'wb')image_result.write(data)

I was implementing password hashing with salt, so I generated salt as binary, hashed the password, base64 encoded the password and salt then stored them into database.

Now when I am checking password, I am supposed to decode the salt back into binary data, use it to hash the supplied password, base64 encode the result and check if the result matches the one in database.

The problem is, I cannot find a method to decode the salt back into binary data. I encoded them using the Buffer.toString method but there doesn't seem to be reverse function.