Grand test fixup (#138)

* start fixing up tests

* fix up tests + automate with drone

* fiddle with linting

* messing about with drone.yml

* some more fiddling

* hmmm

* add cache

* add vendor directory

* verbose

* ci updates

* update some little things

* update sig

vendor/github.com/quasoft/memstore/memstore.go

@@ -0,0 +1,155 @@
+package memstore
+
+import (
+	"bytes"
+	"encoding/base32"
+	"encoding/gob"
+	"fmt"
+	"net/http"
+	"strings"
+
+	"github.com/gorilla/securecookie"
+	"github.com/gorilla/sessions"
+)
+
+// MemStore is an in-memory implementation of gorilla/sessions, suitable
+// for use in tests and development environments. Do not use in production.
+// Values are cached in a map. The cache is protected and can be used by
+// multiple goroutines.
+type MemStore struct {
+	Codecs  []securecookie.Codec
+	Options *sessions.Options
+	cache   *cache
+}
+
+type valueType map[interface{}]interface{}
+
+// NewMemStore returns a new MemStore.
+//
+// Keys are defined in pairs to allow key rotation, but the common case is
+// to set a single authentication key and optionally an encryption key.
+//
+// The first key in a pair is used for authentication and the second for
+// encryption. The encryption key can be set to nil or omitted in the last
+// pair, but the authentication key is required in all pairs.
+//
+// It is recommended to use an authentication key with 32 or 64 bytes.
+// The encryption key, if set, must be either 16, 24, or 32 bytes to select
+// AES-128, AES-192, or AES-256 modes.
+//
+// Use the convenience function securecookie.GenerateRandomKey() to create
+// strong keys.
+func NewMemStore(keyPairs ...[]byte) *MemStore {
+	store := MemStore{
+		Codecs: securecookie.CodecsFromPairs(keyPairs...),
+		Options: &sessions.Options{
+			Path:   "/",
+			MaxAge: 86400 * 30,
+		},
+		cache: newCache(),
+	}
+	store.MaxAge(store.Options.MaxAge)
+	return &store
+}
+
+// Get returns a session for the given name after adding it to the registry.
+//
+// It returns a new session if the sessions doesn't exist. Access IsNew on
+// the session to check if it is an existing session or a new one.
+//
+// It returns a new session and an error if the session exists but could
+// not be decoded.
+func (m *MemStore) Get(r *http.Request, name string) (*sessions.Session, error) {
+	return sessions.GetRegistry(r).Get(m, name)
+}
+
+// New returns a session for the given name without adding it to the registry.
+//
+// The difference between New() and Get() is that calling New() twice will
+// decode the session data twice, while Get() registers and reuses the same
+// decoded session after the first call.
+func (m *MemStore) New(r *http.Request, name string) (*sessions.Session, error) {
+	session := sessions.NewSession(m, name)
+	options := *m.Options
+	session.Options = &options
+	session.IsNew = true
+
+	c, err := r.Cookie(name)
+	if err != nil {
+		// Cookie not found, this is a new session
+		return session, nil
+	}
+
+	err = securecookie.DecodeMulti(name, c.Value, &session.ID, m.Codecs...)
+	if err != nil {
+		// Value could not be decrypted, consider this is a new session
+		return session, err
+	}
+
+	v, ok := m.cache.value(session.ID)
+	if !ok {
+		// No value found in cache, don't set any values in session object,
+		// consider a new session
+		return session, nil
+	}
+
+	// Values found in session, this is not a new session
+	session.Values = m.copy(v)
+	session.IsNew = false
+	return session, nil
+}
+
+// Save adds a single session to the response.
+// Set Options.MaxAge to -1 or call MaxAge(-1) before saving the session to delete all values in it.
+func (m *MemStore) Save(r *http.Request, w http.ResponseWriter, s *sessions.Session) error {
+	var cookieValue string
+	if s.Options.MaxAge < 0 {
+		cookieValue = ""
+		m.cache.delete(s.ID)
+		for k := range s.Values {
+			delete(s.Values, k)
+		}
+	} else {
+		if s.ID == "" {
+			s.ID = strings.TrimRight(base32.StdEncoding.EncodeToString(securecookie.GenerateRandomKey(32)), "=")
+		}
+		encrypted, err := securecookie.EncodeMulti(s.Name(), s.ID, m.Codecs...)
+		if err != nil {
+			return err
+		}
+		cookieValue = encrypted
+		m.cache.setValue(s.ID, m.copy(s.Values))
+	}
+	http.SetCookie(w, sessions.NewCookie(s.Name(), cookieValue, s.Options))
+	return nil
+}
+
+// MaxAge sets the maximum age for the store and the underlying cookie
+// implementation. Individual sessions can be deleted by setting Options.MaxAge
+// = -1 for that session.
+func (m *MemStore) MaxAge(age int) {
+	m.Options.MaxAge = age
+
+	// Set the maxAge for each securecookie instance.
+	for _, codec := range m.Codecs {
+		if sc, ok := codec.(*securecookie.SecureCookie); ok {
+			sc.MaxAge(age)
+		}
+	}
+}
+
+func (m *MemStore) copy(v valueType) valueType {
+	var buf bytes.Buffer
+	enc := gob.NewEncoder(&buf)
+	dec := gob.NewDecoder(&buf)
+	err := enc.Encode(v)
+	if err != nil {
+		panic(fmt.Errorf("could not copy memstore value. Encoding to gob failed: %v", err))
+	}
+	var value valueType
+	err = dec.Decode(&value)
+	if err != nil {
+		panic(fmt.Errorf("could not copy memstore value. Decoding from gob failed: %v", err))
+	}
+	return value
+}