function whether expected or not, rather than continue and try to
compare invalid decoded results.
Extend the unit test slightly to check the header.
Remove go-test/deep dependency in favour of standard library reflect
package.
Hex encoding the Data field in the SASL responses made debugging SCRAM
more difficult than actually helping.
Before:
F{"Type":"SASLResponse","Data":"633d655377732c723d4d4d4e4e6d666b536f5862694a68385833466d324f2b4d77787354692f4550753052414157484b7a306b7376336c5747392f4d4a5267504d2c703d616742664b533164383937674b4f4a6d4c7171626c49326b6b4a506f2b58354359516c63473458357657343d"}
F{"Type":"SASLInitialResponse","AuthMechanism":"SCRAM-SHA-256","Data":"792c2c6e3d2c723d4d4d4e4e6d666b536f5862694a68385833466d324f2b4d77"}
After:
F{"Type":"SASLResponse","Data":"c=eSws,r=9dR43UQLL1KbrKKl4/QbxjqgVjZYR9mqnx3rFBiI7R/1pp5oeVYMGhXj,p=b2hmuvTvWn2xN0fclm+O4TwLAarRM8xoHSN7jsKDHAU="}
F{"Type":"SASLInitialResponse","AuthMechanism":"SCRAM-SHA-256","Data":"y,,n=,r=9dR43UQLL1KbrKKl4/Qbxjqg"}
In the original issue [1] and commit [2], support for unexpected EOF was
added to the frontend to detect when a connection was closed abruptly.
Additionally, this allows us to differentiate normal io.EOF errors with
unexpected errors in the backend.
[1] https://github.com/jackc/pgx/issues/662/
[2] 595780be0f
The pgprotocol overloads 'p' messages with PasswordMessage,
SASLInitialResponse, SASLResponse, and GSSResponse. This patch allows
contextual identification of the message by setting the authType in the
frontend and then setting this value in the backend when a
AuthenticationResponseMessage is received.
io.EOF is never expected during valid usage. In addition, database/sql
uses io.EOF as a sentinal value that all rows from a query have been
received.
See https://github.com/jackc/pgx/issues/662.
Per the PG documentation [0], an AuthenticationSASLContinue message has:
AuthenticationSASLContinue (B)
Byte1('R')
Identifies the message as an authentication request.
Int32
Length of message contents in bytes, including self.
Int32(11)
Specifies that this message contains a SASL challenge.
Byten
SASL data, specific to the SASL mechanism being used.
The current implementation was mistakenly adding the lengh of msg bytes
in between the Int32(11) and Byten. There was a similar issue for
AuthenticationSASLFinal.
[0] https://www.postgresql.org/docs/current/protocol-message-formats.html
