I get the below error and I am unable to figure out why… The script works like a magic for POST method, but not able to figure out this doesn’t work for the GET method.
Invoke-RestMethod : {"errors":[{"code":32,"message":"Could not authenticate you."}]}
At C:\Users\jodi\Documents\REST\gettweets.ps1:81 char:9
+ Invoke-RestMethod -URI $HttpEndPoint -Method Get -Headers @{ ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invoke-
RestMethod], WebException
+ FullyQualifiedErrorId :
WebCmdletWebResponseException,Microsoft.PowerShell.Commands.InvokeRestMethodCommand
Below is the powershell script that is being used.
## Generate a random 32-byte string. I'm using the current time (in seconds) and appending 5 chars to the end to get to 32 bytes
## Base64 allows for an '=' but Twitter does not. If this is found, replace it with some alphanumeric character
$OauthNonce = [System.Convert]::ToBase64String(([System.Text.Encoding]::ASCII.GetBytes("$([System.DateTime]::Now.Ticks.ToString())12345"))).Replace('=', 'g')
Write-Host "Generated Oauth none string '$OauthNonce'"
## Find the total seconds since 1/1/1970 (epoch time)
$EpochTimeNow = [System.DateTime]::UtcNow - [System.DateTime]::ParseExact("01/01/1970", "dd/MM/yyyy", $null)
Write-Host "Generated epoch time '$EpochTimeNow'"
$OauthTimestamp = [System.Convert]::ToInt64($EpochTimeNow.TotalSeconds).ToString();
Write-Host "Generated Oauth timestamp '$OauthTimestamp'"
## Build the signature
$SignatureBase = "$([System.Uri]::EscapeDataString($HttpEndPoint))&"
$SignatureParams = @{
'oauth_consumer_key' = $ApiKey;
'oauth_nonce' = $OauthNonce;
'oauth_signature_method' = 'HMAC-SHA1';
'oauth_timestamp' = $OauthTimestamp;
'oauth_token' = $AccessToken;
'oauth_version' = '1.0';
}
$Message = "test message"
$Username = "quasiwritist"
#$SignatureParams.status = $Message
$SignatureParams.screen_name = $Username
$SignatureParams.count = 2
##Create a string called $SignatureBase that joins all URL encoded 'Key=Value' elements with a &
## Remove the URL encoded & at the end and prepend the necessary 'POST&' verb to the front
"sorting starts"
$SignatureParams.GetEnumerator() | sort name | foreach {
Write-Host "Adding '$([System.Uri]::EscapeDataString(`"$($_.Key)=$($_.Value)&`"))' to signature string"
$SignatureBase += [System.Uri]::EscapeDataString("$($_.Key)=$($_.Value)&".Replace(',','%2C').Replace('!','%21'))
}
$SignatureBase = $SignatureBase.TrimEnd('%26')
$SignatureBase = 'GET&' + $SignatureBase
Write-Host "Base signature generated '$SignatureBase'"
## Create the hashed string from the base signature
$SignatureKey = [System.Uri]::EscapeDataString($ApiSecret) + "&" + [System.Uri]::EscapeDataString($AccessTokenSecret);
$hmacsha1 = new-object System.Security.Cryptography.HMACSHA1;
$hmacsha1.Key = [System.Text.Encoding]::ASCII.GetBytes($SignatureKey);
$OauthSignature = [System.Convert]::ToBase64String($hmacsha1.ComputeHash([System.Text.Encoding]::ASCII.GetBytes($SignatureBase)));
Write-Host "Using signature '$OauthSignature'"
## Build the authorization headers using most of the signature headers elements. This is joining all of the 'Key=Value' elements again
## and only URL encoding the Values this time while including non-URL encoded double quotes around each value
$AuthorizationParams = $SignatureParams
$AuthorizationParams.Add('oauth_signature', $OauthSignature)
$AuthorizationString = 'OAuth '
$AuthorizationParams.GetEnumerator() | sort name | foreach { $AuthorizationString += $_.Key + '="' + [System.Uri]::EscapeDataString($_.Value) + '", ' }
$AuthorizationString = $AuthorizationString.TrimEnd(', ')
Write-Host "Using authorization string '$AuthorizationString'"
##$AuthorizationString = Get-OAuthAuthorization -TweetMessage $Message -HttpEndPoint $HttpEndPoint
## Convert the message to a Byte array
#$Body = [System.Text.Encoding]::ASCII.GetBytes("status=$Message");
$Body = "status=$Message"
Write-Host "Using POST body '$Body'"
Invoke-RestMethod -URI $HttpEndPoint -Method Get -Headers @{ 'Authorization' = $AuthorizationString } -ContentType "application/x-www-form-urlencoded"
