CODEWITHSUNDEEP
hyperledger-fabrichyperledger-composer
deepak parmar
deepak parmar

Reputation: 701

How to store file into hyperledger fabric using hyperledger composer?

In model file, We have have 'string' data type to store any string. However; If I would like to store file into hyperledger fabric using hyperledger composer, then is there any specific data type?

Upvotes: 0

Views: 1066

Answers (1)

Siu Ching Pong -Asuka Kenji-
Siu Ching Pong -Asuka Kenji-

Reputation: 8213

According to the reference here, the string type contains UTF-8 encoded character sequences. Therefore, you cannot just put the bytes of a file into a string.

One of the possible solution is encoding the file into a base64 (uudncode, base64encode, etc.) string first, and then store it in a string field.

Based on your requirements (personal data regulations, etc.), you may want to store the file off-chain, and store only the cryptographic hash (SHA-1, SHA-256, etc.) of the file in the chain (as a string).

Upvotes: 3

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