Merge pdf files from S3 and store resulted pdf back to S3.
Please note:
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This lambda function uses S3Event to get bucket name and input txt file name.
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Input text file should contain path of pdf files, please see inputFileExample.txt file for reference.
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Code uses same bucket for merged pdf.
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You can define path of merged pdf file and s3 region in AppConfig.java file.
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File name of merged pdf will be same as inputFile name, for example if input file is myFile.txt then merged pdf name will be myFile.pdf