1 files changed, 65 insertions, 0 deletions

diff --git a/echo/ports.go b/echo/ports.go
new file mode 100644
index 0000000..bdd97fe
--- /dev/null
+++ b/echo/ports.go
@@ -0,0 +1,65 @@
+package echo
+
+import (
+        "fmt"
+        "net"
+        "strconv"
+)
+
+type AddressPortConfig struct {
+        HttpPort  int
+        TlsPort   int
+        Addresses []string
+}
+
+func (c *AddressPortConfig) TlsBindings() []string {
+        o := make([]string, len(c.Addresses))
+        for i, a := range c.Addresses {
+                o[i] = net.JoinHostPort(a, strconv.Itoa(c.TlsPort))
+        }
+        return o
+}
+
+func (c *AddressPortConfig) HttpBindings() []string {
+        o := make([]string, len(c.Addresses))
+        for i, a := range c.Addresses {
+                o[i] = net.JoinHostPort(a, strconv.Itoa(c.HttpPort))
+        }
+        return o
+}
+
+func ParseAddressPortBindings(b []string) (*AddressPortConfig, error) {
+        o := &AddressPortConfig{
+                Addresses: make([]string, len(b)),
+        }
+
+        for i, a := range b {
+                host, port, err := net.SplitHostPort(a)
+                if err != nil {
+                        return nil, fmt.Errorf("ParseAddressPortBindings: error splitting address: %w", err)
+                }
+
+                o.Addresses[i] = host
+
+                intPort, err := strconv.Atoi(port)
+                if err != nil {
+                        return nil, fmt.Errorf("ParseAddressPortBindings: error parsing port to string: %w", err)
+                }
+
+                if o.HttpPort == 0 {
+                        o.HttpPort = intPort
+                } else {
+                        if o.HttpPort != intPort {
+                                return nil, fmt.Errorf("ParseAddressPortBindings: all ports must be the same number")
+                        }
+                }
+        }
+
+        if o.HttpPort == 0 {
+                return nil, fmt.Errorf("ParseAddressPortBindings: no valid HTTP port was specified")
+        }
+
+        o.TlsPort = o.HttpPort + 1
+
+        return o, nil
+}