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Arquivo de Função de acesso ao Facebook (achei na net, não lembro o autor, mais não tirei o cabeçalho): LINK
Arquivo de configuração jSON para ASP (retirado do site oficial do jSON: LINK.
Você vai precisar de uma função de base64, eu adicionei a de Encode e Decode, caso precisem em outros projetos.
Você precisa adicionar o ID da sua aplicação, A URL de retorno (não precisa mudar a query que coloquei, facilita a autenticação em um arquivo só), e as permissões em sequencia (isso você acha no facebook developer).
Eu salvei tudo em Session, o token, o signed request e o ID do usuário do facebook:
set user = JSON.parse(base64Decode(playload))
session("signed_request") = request("signed_request")
session("oauth_token") = user.oauth_token
session("id_atual") = user.user_id
response.redirect("pagina.asp")
E Adicionei um Redirect para quando estiver autenticado:Segue o Código completo:
<script language="javascript" runat="server" src="json2.asp"></script>
<!-- #include file="fb_app.asp" -->
<%
session.lcid = 1046
session.timeOut = 1440
server.scriptTimeOut = 999999999
if (request.QueryString("logar") = "") then
main
function main
dim strJSON
dim URL
dim sToken
dim user
dim loc
set cookie = get_facebook_cookie( FACEBOOK_APP_ID, FACEBOOK_SECRET )
if cookie.count > 0 then
response.write "Logado... Ok! <br/>"
sToken = cookie("access_token")
url = "https://graph.facebook.com/me?access_token=" & sToken
strJSON = get_page_contents(URL)
set user = JSON.parse(strJSON)
response.write cookie("access_token")
else
link = "http://www.facebook.com/dialog/oauth?client_id=ID_DA_SUA_APLICAÇÃO&redirect_uri="&server.URLEncode("http://apps.facebook.com/NOME_DA_MINHA_APP/autenticacao.asp?logar=ok")&"&scope=offline_access,user_location,email,publish_stream,user_birthday,read_friendlists"
response.write("<script>top.location.href='" & link & "';</script>")
end if
end function
else
const BASE_64_MAP_INIT ="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
dim nl
dim Base64EncMap(63)
dim Base64DecMap(127)
public sub initCodecs()
nl = "<P>" & chr(13) & chr(10)
dim max, idx
max = len(BASE_64_MAP_INIT)
for idx = 0 to max - 1
Base64EncMap(idx) = mid(BASE_64_MAP_INIT, idx + 1, 1)
next
for idx = 0 to max - 1
Base64DecMap(asc(Base64EncMap(idx))) = idx
next
end sub
public function base64Encode(plain)
if len(plain) = 0 then
base64Encode = ""
exit function
end if
dim ret, ndx, by3, first, second, third
by3 = (len(plain) \ 3) * 3
ndx = 1
do while ndx <= by3
first = asc(mid(plain, ndx + 0, 1))
second = asc(mid(plain, ndx + 1, 1))
third = asc(mid(plain, ndx + 2, 1))
ret = ret & Base64EncMap((first \ 4) and 63)
ret = ret & Base64EncMap(((first * 16) and 48) + ((second \ 16) and 15))
ret = ret & Base64EncMap(((second * 4) and 60) + ((third \ 64) and 3))
ret = ret & Base64EncMap(third and 63)
ndx = ndx + 3
loop
if by3 < len(plain) then
first = asc(mid(plain, ndx + 0, 1))
ret = ret & Base64EncMap((first \ 4) and 63)
if (len(plain) MOD 3) = 2 then
second = asc(mid(plain, ndx+1, 1))
ret = ret & Base64EncMap(((first * 16) and 48) + ((second \ 16) and 15))
ret = ret & Base64EncMap(((second * 4) and 60))
else
ret = ret & Base64EncMap((first * 16) and 48)
ret = ret & "="
end if
ret = ret & "="
end if
base64Encode = ret
end function
public function base64Decode(scrambled)
if len(scrambled) = 0 then
base64Decode = ""
exit function
end if
dim realLen
realLen = len(scrambled)
do while mid(scrambled, realLen, 1) = "="
realLen = realLen - 1
loop
dim ret, ndx, by4, first, second, third, fourth
ret = ""
by4 = (realLen \ 4) * 4
ndx = 1
do while ndx <= by4
first = Base64DecMap(asc(mid(scrambled, ndx+0, 1)))
second = Base64DecMap(asc(mid(scrambled, ndx+1, 1)))
third = Base64DecMap(asc(mid(scrambled, ndx+2, 1)))
fourth = Base64DecMap(asc(mid(scrambled, ndx+3, 1)))
ret = ret & chr(((first * 4) and 255) + ((second \ 16) and 3))
ret = ret & chr(((second * 16) and 255) + ((third \ 4) and 15))
ret = ret & chr(((third * 64) and 255) + (fourth and 63))
ndx = ndx + 4
loop
if ndx < realLen then
first = Base64DecMap(asc(mid(scrambled, ndx+0, 1)))
second = Base64DecMap(asc(mid(scrambled, ndx+1, 1)))
ret = ret & chr(((first * 4) and 255) + ((second \ 16) and 3))
if realLen mod 4 = 3 then
third = Base64DecMap(asc(mid(scrambled,ndx+2,1)))
ret = ret & chr(((second * 16) and 255) + ((third \ 4) and 15))
end if
end if
base64Decode = ret
end function
call initCodecs
splitvar = split(request("signed_request"), ".")
encoded_sig = splitvar(0)
playload = splitvar(1)
set user = JSON.parse(base64Decode(playload))
session("signed_request") = request("signed_request")
session("oauth_token") = user.oauth_token
session("id_atual") = user.user_id
response.redirect("animacao.asp")
end if
%> cortesia de nosso amigo Ted´k
