remove fallback parsing logic (#574)

Author: JanProvaznik

Diff for: src/dotnet-install.ps1

@@ -992,32 +992,6 @@ function PrintDryRunOutput($Invocation, $DownloadLinks) {
     }
 }
 
-# grab the 'stem' of the redirect and check it against all of our configured feeds, 
-# if it matches, we can be sure that the redirect is valid and we should use it for
-# subsequent processing
-function Sanitize-RedirectUrl([string]$url) {
-    $urlSegments = ([System.Uri]$url).Segments;
-    $urlStem = $urlSegments[2..($urlSegments.Length - 1)] -join "";
-    Write-Verbose "Checking configured feeds for the asset at $urlStem"
-    foreach ($prospectiveFeed in $feeds) {
-        $trialUrl = "$prospectiveFeed/$urlStem";
-        Write-Verbose "Checking $trialUrl"
-        try {
-            $trialResponse = Invoke-WebRequest -Uri $trialUrl -Method HEAD
-            if ($trialResponse.StatusCode -eq 200) {
-                Write-Verbose "Found a match at $trialUrl"
-                return $trialUrl;
-            }
-            else {
-                Write-Verbose "No match at $trialUrl"
-            }
-        }
-        catch {
-            Write-Verbose "Failed to check $trialUrl"
-        }
-    }
-}
-
 function Get-AkaMSDownloadLink([string]$Channel, [string]$Quality, [bool]$Internal, [string]$Product, [string]$Architecture) {
     Say-Invocation $MyInvocation 
 
@@ -1076,11 +1050,6 @@ function Get-AkaMSDownloadLink([string]$Channel, [string]$Quality, [bool]$Intern
         }
         elseif ((($Response.StatusCode -lt 300) -or ($Response.StatusCode -ge 400)) -and (-not [string]::IsNullOrEmpty($akaMsDownloadLink))) {
             # Redirections have ended.
-            $actualRedirectUrl = Sanitize-RedirectUrl $akaMsDownloadLink
-            if ($null -ne $actualRedirectUrl) {
-                $akaMsDownloadLink = $actualRedirectUrl
-            }
-
             return $akaMsDownloadLink
         }
 

Diff for: src/dotnet-install.sh

@@ -1272,61 +1272,6 @@ downloadwget() {
     return 0
 }
 
-extract_stem() {
-    local url="$1"
-    # extract the protocol
-    proto="$(echo $1 | grep :// | sed -e's,^\(.*://\).*,\1,g')"
-    # remove the protocol
-    url="${1/$proto/}"
-    # extract the path (if any) - since we know all of our feeds have a first path segment, we can skip the first one. otherwise we'd use -f2- to get the full path
-    full_path="$(echo $url | grep / | cut -d/ -f2-)"
-    path="$(echo $full_path | cut -d/ -f2-)"
-    echo $path
-}
-
-check_url_exists() {
-    eval $invocation
-    local url="$1"
-
-    local code=""
-    if machine_has "curl"
-    then
-        code=$(curl --head -o /dev/null -w "%{http_code}" -s --fail "$url");
-    elif machine_has "wget"
-    then
-        # get the http response, grab the status code
-        server_response=$(wget -qO- --method=HEAD --server-response "$url" 2>&1)
-        code=$(echo "$server_response" | grep "HTTP/" | awk '{print $2}')
-    fi
-    if [ $code = "200" ]; then
-        return 0
-    else
-        return 1
-    fi
-}
-
-sanitize_redirect_url() {
-    eval $invocation
-
-    local url_stem
-    url_stem=$(extract_stem "$1")
-    say_verbose "Checking configured feeds for the asset at ${yellow:-}$url_stem${normal:-}"
-
-    for feed in "${feeds[@]}"
-    do
-        local trial_url="$feed/$url_stem"
-        say_verbose "Checking ${yellow:-}$trial_url${normal:-}"
-        if check_url_exists "$trial_url"; then
-            say_verbose "Found a match at ${yellow:-}$trial_url${normal:-}"
-            echo "$trial_url"
-            return 0
-        else
-            say_verbose "No match at ${yellow:-}$trial_url${normal:-}"
-        fi
-    done
-    return 1
-}
-
 get_download_link_from_aka_ms() {
     eval $invocation
 
@@ -1379,11 +1324,6 @@ get_download_link_from_aka_ms() {
             return 1
         fi
 
-        sanitized_redirect_url=$(sanitize_redirect_url "$aka_ms_download_link")
-        if [[ -n "$sanitized_redirect_url" ]]; then
-            aka_ms_download_link="$sanitized_redirect_url"
-        fi
-
         say_verbose "The redirect location retrieved: '$aka_ms_download_link'."
         return 0
     else