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@ -5,7 +5,7 @@
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// Implements support for federated avatars lookup.
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// See https://wiki.libravatar.org/api/
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package libravatar
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package libravatar // import "strk.kbt.io/projects/go/libravatar"
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import (
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"crypto/md5"
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@ -16,6 +16,7 @@ import (
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"net/mail"
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"net/url"
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"strings"
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"sync"
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"time"
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)
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@ -38,7 +39,8 @@ const (
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)
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var (
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// Default object, enabling object-less function calls
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// DefaultLibravatar is a default Libravatar object,
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// enabling object-less function calls
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DefaultLibravatar = New()
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)
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@ -53,14 +55,16 @@ type cacheValue struct {
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checkedAt time.Time
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}
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// Libravatar is an opaque structure holding service configuration
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type Libravatar struct {
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defUrl string // default url
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defURL string // default url
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picSize int // picture size
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fallbackHost string // default fallback URL
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secureFallbackHost string // default fallback URL for secure connections
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useHTTPS bool
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nameCache map[cacheKey]cacheValue
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nameCacheDuration time.Duration
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nameCacheMutex *sync.Mutex
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minSize uint // smallest image dimension allowed
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maxSize uint // largest image dimension allowed
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size uint // what dimension should be used
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@ -68,7 +72,7 @@ type Libravatar struct {
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secureServiceBase string // SRV record to be queried for federation with secure servers
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}
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// Instanciate a library handle
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// New instanciates a new Libravatar object (handle)
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func New() *Libravatar {
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// According to https://wiki.libravatar.org/running_your_own/
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// the time-to-live (cache expiry) should be set to at least 1 day.
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@ -82,27 +86,28 @@ func New() *Libravatar {
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secureServiceBase: `avatars-sec`,
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nameCache: make(map[cacheKey]cacheValue),
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nameCacheDuration: 24 * time.Hour,
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nameCacheMutex: &sync.Mutex{},
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}
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}
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// Set the hostname for fallbacks in case no avatar service is defined
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// for a domain
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// SetFallbackHost sets the hostname for fallbacks in case no avatar
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// service is defined for a domain
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func (v *Libravatar) SetFallbackHost(host string) {
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v.fallbackHost = host
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}
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// Set the hostname for fallbacks in case no avatar service is defined
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// for a domain, when requiring secure domains
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// SetSecureFallbackHost sets the hostname for fallbacks in case no
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// avatar service is defined for a domain, when requiring secure domains
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func (v *Libravatar) SetSecureFallbackHost(host string) {
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v.secureFallbackHost = host
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}
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// Set useHTTPS flag
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// SetUseHTTPS sets flag requesting use of https for fetching avatars
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func (v *Libravatar) SetUseHTTPS(use bool) {
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v.useHTTPS = use
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}
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// Set Avatars image dimension (0 for default)
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// SetAvatarSize sets avatars image dimension (0 for default)
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func (v *Libravatar) SetAvatarSize(size uint) {
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v.size = size
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}
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@ -150,8 +155,8 @@ func (v *Libravatar) process(email *mail.Address, openid *url.URL) (string, erro
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res := fmt.Sprintf("%s/avatar/%s", URL, v.genHash(email, openid))
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values := make(url.Values)
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if v.defUrl != "" {
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values.Add("d", v.defUrl)
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if v.defURL != "" {
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values.Add("d", v.defURL)
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}
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if v.size > 0 {
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values.Add("s", fmt.Sprintf("%d", v.size))
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@ -181,7 +186,9 @@ func (v *Libravatar) baseURL(email *mail.Address, openid *url.URL) (string, erro
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host := v.getDomain(email, openid)
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key := cacheKey{service, host}
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now := time.Now()
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v.nameCacheMutex.Lock()
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val, found := v.nameCache[key]
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v.nameCacheMutex.Unlock()
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if found && now.Sub(val.checkedAt) <= v.nameCacheDuration {
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return protocol + val.target, nil
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}
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@ -204,53 +211,55 @@ func (v *Libravatar) baseURL(email *mail.Address, openid *url.URL) (string, erro
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}
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var (
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total_weight uint16
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records []record
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top_priority = addrs[0].Priority
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top_record *net.SRV
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totalWeight uint16
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records []record
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topPriority = addrs[0].Priority
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topRecord *net.SRV
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)
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for _, rr := range addrs {
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if rr.Priority > top_priority {
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if rr.Priority > topPriority {
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continue
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} else if rr.Priority < top_priority {
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} else if rr.Priority < topPriority {
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// won't happen, because net sorts
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// by priority, but just in case
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total_weight = 0
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totalWeight = 0
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records = nil
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top_priority = rr.Priority
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topPriority = rr.Priority
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}
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total_weight += rr.Weight
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totalWeight += rr.Weight
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if rr.Weight > 0 {
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records = append(records, record{rr, total_weight})
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records = append(records, record{rr, totalWeight})
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} else if rr.Weight == 0 {
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records = append([]record{record{srv: rr, weight: total_weight}}, records...)
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records = append([]record{record{srv: rr, weight: totalWeight}}, records...)
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}
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}
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if len(records) == 1 {
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top_record = records[0].srv
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topRecord = records[0].srv
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} else {
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randnum := uint16(rand.Intn(int(total_weight)))
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randnum := uint16(rand.Intn(int(totalWeight)))
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for _, rr := range records {
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if rr.weight >= randnum {
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top_record = rr.srv
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topRecord = rr.srv
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break
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}
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}
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}
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domain = fmt.Sprintf("%s:%d", top_record.Target, top_record.Port)
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domain = fmt.Sprintf("%s:%d", topRecord.Target, topRecord.Port)
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}
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v.nameCacheMutex.Lock()
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v.nameCache[key] = cacheValue{checkedAt: now, target: domain}
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v.nameCacheMutex.Unlock()
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return protocol + domain, nil
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}
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// Return url of the avatar for the given email
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// FromEmail returns the url of the avatar for the given email
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func (v *Libravatar) FromEmail(email string) (string, error) {
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addr, err := mail.ParseAddress(email)
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if err != nil {
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@ -265,12 +274,13 @@ func (v *Libravatar) FromEmail(email string) (string, error) {
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return link, nil
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}
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// Object-less call to DefaultLibravatar for an email adders
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// FromEmail is the object-less call to DefaultLibravatar for an email adders
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func FromEmail(email string) (string, error) {
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return DefaultLibravatar.FromEmail(email)
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}
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// Return url of the avatar for the given url (typically for OpenID)
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// FromURL returns the url of the avatar for the given url (typically
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// for OpenID)
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func (v *Libravatar) FromURL(openid string) (string, error) {
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ourl, err := url.Parse(openid)
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if err != nil {
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@ -291,7 +301,7 @@ func (v *Libravatar) FromURL(openid string) (string, error) {
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return link, nil
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}
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// Object-less call to DefaultLibravatar for a URL
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// FromURL is the object-less call to DefaultLibravatar for a URL
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func FromURL(openid string) (string, error) {
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return DefaultLibravatar.FromURL(openid)
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}
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guillep2k
5 years ago
committed by
techknowlogick