How do I output error messages with HTTP error codes in Sinatra?

Question

I'm trying to handle errors nicely using Sinatra. For example, say I have a block like this:

get '/auth/' do
    ...
    begin
        access_token_obj = OAuth2::AccessToken.new(client, token)
    rescue OAuth2::Error => e
        return 403, e.description
    rescue
        return 403, "Something went wrong"
    end
    ...
end

I want to display a nice error page to the user. The Sinatra docs suggest I can do something like:

error 403 do
    "Access forbidden"
end

But how do I get the error message ("Something went wrong" or e.description) to display to the user? In my error 403 do block there is no env['sinatra.error'] available. I'm obviously missing something (I'm a bit new to ruby).

Thomas Ruiz · Accepted Answer · 2013-06-20 15:40:24Z

2

Look in the body variable, you'll have the error message in the first index, so in body[0].

answered Jun 20, 2013 at 15:40

Thomas Ruiz

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5 Comments

Phil Gyford Over a year ago

Within error 403 do? In there, body is an empty array for me.

Thomas Ruiz Over a year ago

Strange, I can find it in a 6 lines scripts. Just return inspect instead of "Access forbidden" within error 403 do, and see if you can find anywhere your error message.

Phil Gyford Over a year ago

Ahh... if I replace the return 403, e.description with return 403, e then I get an OAuth2::Error object in body. But I can't work out how to get the error message out of it.

Phil Gyford Over a year ago

If I do body.inspect I get this: ` #<OAuth2::Error: {"errors"=>[{"domain"=>"global", "reason"=>"authError", "message"=>"Invalid Credentials", "locationType"=>"header", "location"=>"Authorization"}], "code"=>401, "message"=>"Invalid Credentials"}: {"error":{"errors":[{"domain":"global","reason":"authError","message":"Invalid Credentials","locationType":"header","location":"Authorization"}],"code":401,"message":"Invalid Credentials"}}>`

Phil Gyford Over a year ago

Well, I'm a bit baffled. I think I'll just replace e.description with "My error message" which I can indeed get out of body[0]. So thanks for that pointer Thomas.

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