| 1 | package contra |
| 2 | |
| 3 | import ( |
| 4 | "log/slog" |
| 5 | "net/http" |
| 6 | |
| 7 | "github.com/carlosframework/rastrillo" |
| 8 | "github.com/carlosframework/rastrillo/db" |
| 9 | "github.com/carlosframework/rastrillo/sessions" |
| 10 | |
| 11 | "github.com/carlosframework/contra/internal/contra/auth" |
| 12 | ) |
| 13 | |
| 14 | // app holds what every handler needs. |
| 15 | type app struct { |
| 16 | db *db.DB |
| 17 | logger *slog.Logger |
| 18 | sess *sessions.Sessions |
| 19 | auth *auth.Auth |
| 20 | } |
| 21 | |
| 22 | // page is the data every template renders against. |
| 23 | type page struct { |
| 24 | Version string |
| 25 | SignedIn bool |
| 26 | KDFParams string |
| 27 | LinkError string |
| 28 | } |
| 29 | |
| 30 | func (a *app) pageData(r *http.Request) page { |
| 31 | _, signedIn := sessions.Current(r) |
| 32 | return page{ |
| 33 | Version: rastrillo.BuildVersion, |
| 34 | SignedIn: signedIn, |
| 35 | KDFParams: auth.DefaultKDFParams, |
| 36 | } |
| 37 | } |
| 38 | |
| 39 | // index names the running build, so looking at the canary tells you which |
| 40 | // release you are looking at — the same fact GET /api/version reports to the |
| 41 | // platform's deploy check, on the page a person actually opens. |
| 42 | func (a *app) index(w http.ResponseWriter, r *http.Request) { |
| 43 | render(w, "index", a.pageData(r)) |
| 44 | } |
| 45 | |
| 46 | // The three signup screens. Each one knows only what it needs, so a failure |
| 47 | // on any of them says which step it was. |
| 48 | func (a *app) signupStart(w http.ResponseWriter, r *http.Request) { |
| 49 | d := a.pageData(r) |
| 50 | d.LinkError = linkErrors[r.URL.Query().Get("e")] |
| 51 | render(w, "signup", d) |
| 52 | } |
| 53 | |
| 54 | func (a *app) signupSent(w http.ResponseWriter, r *http.Request) { |
| 55 | render(w, "signup_sent", a.pageData(r)) |
| 56 | } |
| 57 | |
| 58 | // signupPassphrase is only reachable with a verified signup session. Anyone |
| 59 | // else goes back to the start rather than being shown a form that cannot |
| 60 | // possibly work. |
| 61 | func (a *app) signupPassphrase(w http.ResponseWriter, r *http.Request) { |
| 62 | if _, err := a.auth.SignupSessionOf(r); err != nil { |
| 63 | http.Redirect(w, r, "/signup?e=expired", http.StatusSeeOther) |
| 64 | return |
| 65 | } |
| 66 | render(w, "signup_passphrase", a.pageData(r)) |
| 67 | } |
| 68 | |
| 69 | // signupPasskey is the optional third step, and it is behind a real session: |
| 70 | // by here the account exists. |
| 71 | func (a *app) signupPasskey(w http.ResponseWriter, r *http.Request) { |
| 72 | if _, ok := sessions.Current(r); !ok { |
| 73 | http.Redirect(w, r, "/signin", http.StatusSeeOther) |
| 74 | return |
| 75 | } |
| 76 | render(w, "signup_passkey", a.pageData(r)) |
| 77 | } |
| 78 | |
| 79 | // linkErrors turns the query parameter a redirect carries into a sentence. |
| 80 | // The redirect cannot carry the sentence itself: a message passed through a |
| 81 | // URL is a message an attacker can choose. |
| 82 | var linkErrors = map[string]string{ |
| 83 | "badlink": "That link did not work. It may have been used already, or copied " + |
| 84 | "incompletely from the email.", |
| 85 | "expired": "That link has expired. Links last thirty minutes; ask for a new one.", |
| 86 | "failed": "Something went wrong following that link. Try asking for a new one.", |
| 87 | } |
| 88 | |
| 89 | func (a *app) signinPage(w http.ResponseWriter, r *http.Request) { |
| 90 | render(w, "signin", a.pageData(r)) |
| 91 | } |
| 92 | |
| 93 | // vault is the signed-in surface, and at this slice it is deliberately almost |
| 94 | // empty: the items themselves are web/6. What it proves today is that the |
| 95 | // ceremony ends somewhere only a signed-in browser can reach. |
| 96 | func (a *app) vault(w http.ResponseWriter, r *http.Request) { |
| 97 | render(w, "vault", a.pageData(r)) |
| 98 | } |
| 99 | |
| 100 | // device is the ladder: the screen a browser reaches when it is signed in but |
| 101 | // has no Account Key, and the screen an enrolled browser reaches to approve |
| 102 | // one that is waiting. Both roles live on one page because a person arriving |
| 103 | // here has to be able to do either without being told which link to click. |
| 104 | func (a *app) device(w http.ResponseWriter, r *http.Request) { |
| 105 | render(w, "device", a.pageData(r)) |
| 106 | } |
| 107 | |
| 108 | // kit is the reprint flow. PROTOCOL.md: if either document is lost while a |
| 109 | // device is still enrolled, producing a new one must be obvious rather than |
| 110 | // buried — it is the mitigation for the loss mode the Account Key introduced. |
| 111 | func (a *app) kit(w http.ResponseWriter, r *http.Request) { |
| 112 | render(w, "kit", a.pageData(r)) |
| 113 | } |
| 114 | |
amadan